Kidney disease guide - symptoms, treatment, and holistic support for dogs and cats with renal issues
Kidney Disease

Kidney Disease in Dogs and Cats: Symptoms, Stages, Diet and Holistic Support

Kidney disease can develop gradually over time or occur suddenly following toxin exposure, infection, dehydration or another serious health event. Early signs—such as increased thirst, frequent urination, nausea, weight loss and changes in appetite—can be easy to overlook. Although chronic kidney disease cannot usually be reversed, early diagnosis, proper hydration, individualized nutrition and carefully selected supportive therapies may help slow its progression and preserve quality of life.

Moisture-rich food can be beneficial for many pets with kidney disease, but the diet must also be appropriate for the pet’s phosphorus level, kidney stage, protein needs, potassium level and other health conditions. Raw food may not be appropriate for every kidney patient, particularly pets with weakened immune systems (you should use gently cooked food). Kibble is not appropriate for pets with kidney disease because they need moisture in their diets. 

Herbs and supplements may provide valuable whole-body support, but they should be selected according to the pet’s kidney stage, laboratory results, medications and individual needs. Products marketed for liver or kidney cleansing should be used with guidance from a holistic or integrative veterinarian.

 

We recommend Adored Beast Liver Tonic or Four Leaf Rover Liver and Kidney Clean (10% off full priced items with coupon: SAVING PETS).  You can also use milk thistle.

Medicinal mushrooms such as Cordyceps and Reishi may provide antioxidant, immune and vitality support as part of a whole-pet kidney plan. Evidence specific to dogs and cats with kidney disease remains limited, so the product should be selected according to the pet’s health, medications and kidney stage.

Table of Contents

Understanding Kidney Disease in Dogs and Cats

Kidney disease is common in dogs and cats, particularly as they age. The kidneys filter waste from the blood, maintain fluid and electrolyte balance, help regulate blood pressure and produce hormones needed for healthy red blood cells.

When kidney function declines, waste products can accumulate and affect the entire body. A holistic approach supports more than kidney values alone—it considers hydration, fresh nutrition, digestion, medications, stress, comfort and the pet’s overall quality of life.

Chronic Kidney Disease vs. Acute Kidney Injury

Kidney problems generally fall into two categories:

  • Chronic Kidney Disease (CKD): Develops gradually over time and is most commonly diagnosed in senior pets. Although damaged kidney tissue cannot usually be restored, early detection and individualized support may help slow progression and maintain a good quality of life.

  • Acute Kidney Injury (AKI): Develops suddenly and may be caused by toxins, infection, severe dehydration, urinary obstruction, certain medications or another serious health event. Some pets can recover kidney function when the cause is identified and treated quickly. Acute kidney injury requires prompt veterinary care.

Signs of Kidney Disease

Kidney disease can be difficult to recognize during its early stages. Changes to watch for include:

  • Drinking and urinating more than usual

  • Weight loss

  • Loss of muscle

  • Poor or changing appetite

  • Nausea or vomiting

  • Bad breath, sometimes with a chemical or ammonia-like smell

  • Low energy or weakness

  • Dehydration

  • A dull or unkempt coat

  • Mouth ulcers in more advanced cases

A pet that produces very little or no urine, repeatedly vomits, becomes profoundly weak or may have consumed a kidney toxin needs immediate veterinary attention.

What Causes Kidney Disease?

Kidney disease may have one or several contributing causes, including:

  • Age-related changes

  • Chronic dehydration

  • Infections such as leptospirosis

  • Urinary tract infections that spread to the kidneys

  • Toxins such as antifreeze, lilies in cats, grapes or raisins in dogs and certain medications

  • Urinary obstruction

  • High blood pressure

  • Inherited or congenital kidney disorders

  • Chronic inflammation or immune-mediated disease

  • Other health conditions that reduce blood flow to the kidneys

In some pets, particularly those with chronic kidney disease, the original cause may never be identified.

How Kidney Disease Is Diagnosed

A complete kidney evaluation involves more than looking at one elevated blood value. Veterinarians may use bloodwork, urinalysis, blood-pressure measurement, urine culture and imaging to understand how well the kidneys are functioning.

Important tests may include:

  • BUN

  • Creatinine

  • SDMA

  • Phosphorus

  • Potassium

  • Calcium

  • Red blood cell count

  • Urine-specific gravity

  • Urine protein-to-creatinine ratio

  • Blood pressure

  • Urine culture when infection is suspected

  • Ultrasound or other imaging when appropriate

Dehydration can temporarily raise certain kidney values, so results should be interpreted alongside the pet’s hydration status, symptoms, medications and previous laboratory results.

Veterinarians commonly use IRIS guidelines to stage chronic kidney disease. The kidney values, blood pressure and amount of protein lost in the urine help determine which nutritional changes, medications and supportive therapies may be appropriate.

 

Holistic approach to kidney disease in dogs and cats

Understanding the IRIS Stages of Kidney Disease

The International Renal Interest Society (IRIS) developed a four-stage system to help veterinarians evaluate chronic kidney disease in dogs and cats. Knowing the stage helps guide monitoring, nutrition, hydration, conventional treatment and holistic support.

IRIS staging is performed after chronic kidney disease has been diagnosed and the pet is stable and adequately hydrated. The stage should never be determined from one abnormal blood result alone. Creatinine, SDMA, urinalysis, urine-specific gravity, muscle condition, hydration and changes over time all contribute to the overall picture.

Pets are also substaged according to:

  • Blood pressure
  • Protein loss in the urine
  • Other laboratory abnormalities
  • Symptoms and overall quality of life

Because pets with the same kidney stage may have very different needs, all care should be individualized.

IRIS Stage 1 Kidney Disease

During Stage 1, creatinine may still fall within the normal laboratory range. Kidney disease may be suspected because of other findings, such as:

  • Persistently elevated SDMA
  • Inability to concentrate urine properly
  • Protein in the urine
  • Abnormal kidney structure seen on imaging
  • A previous kidney injury
  • Gradually changing kidney values
  • An inherited or congenital kidney disorder

Most pets have few or no obvious symptoms during Stage 1. This makes early screening especially important for senior pets and breeds predisposed to kidney disease.

Holistic support during this stage may focus on:

  • Increasing dietary moisture
  • Feeding fresh, minimally processed food
  • Reviewing the phosphorus content of the diet
  • Supporting a healthy body weight and muscle condition
  • Providing clean, filtered water
  • Supporting digestive and microbiome health
  • Avoiding unnecessary exposure to kidney toxins
  • Monitoring blood pressure and urine protein
  • Using carefully selected herbs, mushrooms or omega-3 fatty acids when appropriate

Stage 1 offers an important opportunity to support the whole pet before more significant kidney changes develop.

IRIS Stage 2 Kidney Disease

In Stage 2, kidney values are mildly increased, although some pets still appear completely normal. Others may begin drinking and urinating more, losing weight or becoming less interested in food.

Support during Stage 2 may include:

  • A moisture-rich fresh diet
  • Closer attention to dietary phosphorus
  • An individualized amount of high-quality, digestible protein
  • Omega-3 fatty acids when appropriate
  • Support for digestion and the gut microbiome
  • Monitoring potassium, phosphorus and blood pressure
  • Addressing protein loss in the urine
  • Managing nausea or appetite changes
  • Using carefully selected herbs or medicinal mushrooms under professional guidance

This is also an important time to monitor muscle condition. Excessive protein restriction may contribute to muscle loss, weakness and poor appetite, particularly in older pets. Protein and phosphorus should be considered separately and adjusted according to the individual pet.

IRIS Stage 3 Kidney Disease

Stage 3 represents a more significant loss of kidney function. Pets are more likely to experience noticeable symptoms, which may include:

  • Increased thirst and urination
  • Dehydration
  • Poor or inconsistent appetite
  • Nausea or vomiting
  • Weight and muscle loss
  • Weakness or low energy
  • Bad breath
  • Constipation
  • Anemia
  • Elevated phosphorus
  • High blood pressure

Treatment becomes more intensive and should address both the kidney disease and the pet’s comfort. A holistic Stage 3 plan may include:

  • Carefully balanced, moisture-rich nutrition
  • More precise phosphorus management
  • Phosphate binders when prescribed
  • Subcutaneous fluids when appropriate
  • Support for nausea and appetite
  • Omega-3 fatty acids
  • B vitamins or potassium when indicated by testing
  • Gentle digestive and microbiome support
  • Individually selected herbal or mushroom formulas
  • Acupuncture, acupressure or other integrative therapies
  • Regular monitoring of weight, muscle condition and quality of life

The best diet is one that supports the kidneys while still providing enough calories and nourishment to prevent wasting (see recommended diets below). A theoretically perfect kidney diet is not helpful if the pet refuses to eat it.

IRIS Stage 4 Kidney Disease

Stage 4 is the most advanced stage of chronic kidney disease. Waste products may accumulate substantially, and pets often require more intensive care.

Possible signs include:

  • Severe loss of appetite
  • Frequent nausea or vomiting
  • Significant weight and muscle loss
  • Dehydration
  • Profound weakness
  • Mouth ulcers
  • Chemical or ammonia-like breath
  • Anemia
  • Neurological changes
  • Markedly elevated phosphorus
  • Reduced interest in normal activities

At this stage, comfort, hydration, adequate calorie intake and quality of life become especially important. Support may include:

  • Highly individualized, palatable nutrition
  • Careful phosphorus control
  • Subcutaneous or intravenous fluids when appropriate
  • Medication for nausea and appetite
  • Treatment for anemia, high blood pressure or proteinuria
  • Phosphate binders when prescribed
  • Gentle, carefully selected holistic support
  • Acupuncture, Reiki, massage or other comfort-focused therapies
  • Warmth, rest and a calm home environment
  • Honest and compassionate quality-of-life monitoring

Supplements and herbal formulas should be used cautiously in advanced kidney disease because the kidneys may have difficulty clearing certain compounds. More is not necessarily better. Every product should serve a specific purpose and be evaluated alongside the pet’s medications, laboratory results and comfort.

Blood Pressure Substaging

Kidney disease and high blood pressure can worsen one another. For that reason, blood-pressure measurement is an important part of kidney care.

IRIS generally classifies systolic blood pressure as:

  • Below 140 mmHg: Normotensive, with minimal risk of organ damage
  • 140–159 mmHg: Prehypertensive, with low risk
  • 160–179 mmHg: Hypertensive, with moderate risk
  • 180 mmHg or higher: Severely hypertensive, with high risk

One elevated reading does not always confirm hypertension. Fear, stress and movement can temporarily increase a pet’s blood pressure, so repeated measurements in a calm setting may be needed.

Proteinuria Substaging

Healthy kidneys normally prevent significant amounts of protein from passing into the urine. When the kidney’s filtering structures are damaged, protein may begin leaking into the urine.

The urine protein-to-creatinine ratio, commonly called the UPC ratio, helps determine whether a pet is:

  • Non-proteinuric
  • Borderline proteinuric
  • Proteinuric

Persistent protein loss can contribute to kidney disease progression and may require dietary changes, omega-3 support, blood-pressure management or medication.

Urinary infection, inflammation and blood in the urine can affect the UPC result. These conditions should be ruled out before persistent kidney-related proteinuria is diagnosed.

Kidney Stages Can Change

IRIS staging provides a helpful framework, but it does not define the whole pet. Kidney values can change because of dehydration, infection, diet, medication, muscle loss or an acute illness. Pets should be restaged when their condition changes and monitored according to their individual needs.

A holistic kidney plan brings together laboratory findings, hydration, fresh nutrition, digestive health, emotional well-being, comfort and quality of life. The goal is not simply to improve numbers—it is to help the pet feel as well as possible for as long as possible.

Kidney Disease in dogs and cats IRIS Staging freamework for kidney disease

Treatment and Day-to-Day Management

Treatment for kidney disease should be based on whether the condition is acute or chronic, the pet’s IRIS stage, symptoms, laboratory results and other health conditions. There is no single protocol that is right for every dog or cat.

A holistic treatment plan combines appropriate veterinary care with moisture-rich nutrition, hydration, digestive support, carefully chosen supplements, stress reduction and close attention to quality of life. The goal is not simply to improve laboratory values, but to help the whole pet feel and function as well as possible.

Treating Acute Kidney Injury

Acute kidney injury develops suddenly and requires prompt veterinary treatment. Possible causes include toxins, severe dehydration, infection, urinary obstruction, heatstroke and reactions to certain medications.

Treatment may include:

  • Intravenous fluids
  • Treatment for toxin exposure
  • Antibiotics when a bacterial infection is confirmed or strongly suspected
  • Relief of a urinary obstruction
  • Medication to manage nausea, vomiting or pain
  • Correction of electrolyte and acid-base imbalances
  • Nutritional support
  • Careful monitoring of urine production, blood pressure and kidney values

Acute kidney injury may be partially or fully reversible when the cause is identified and treated quickly. Holistic support can be added once the pet is stable, but it should not delay emergency treatment.

Managing Chronic Kidney Disease

Chronic kidney disease cannot usually be cured, but thoughtful care may help slow its progression, reduce symptoms and support a better quality of life.

Management may include:

  • Maintaining proper hydration
  • Feeding a moisture-rich, kidney-appropriate diet
  • Controlling dietary phosphorus
  • Providing an individualized amount of high-quality protein
  • Managing nausea and appetite changes
  • Monitoring blood pressure and protein loss in the urine
  • Correcting potassium or B-vitamin deficiencies
  • Using phosphate binders when needed
  • Supporting digestive and microbiome health
  • Incorporating carefully selected herbs, medicinal mushrooms or other integrative therapies
  • Monitoring weight, muscle condition, energy and quality of life

Treatment needs may change as kidney disease progresses, so food, fluids, supplements and medications should be reassessed regularly.

Supporting Hydration

Hydration is one of the most important parts of kidney support. Damaged kidneys often lose the ability to concentrate urine properly, causing the pet to lose more water through urination.

Ways to encourage hydration include:

  • Feeding fresh, moisture-rich food
  • Adding water to meals
  • Providing several bowls of fresh, filtered water
  • Using a pet fountain if the pet prefers moving water
  • Offering an appropriate low-sodium bone broth
  • Placing water close to the pet’s favorite resting areas
  • Administering subcutaneous fluids when prescribed

Water should never be restricted from a pet with suspected or diagnosed kidney disease unless specifically directed by a veterinarian.

More fluid is not always better. Pets with heart disease, high blood pressure or certain electrolyte imbalances may require a carefully controlled hydration plan.

Managing Nausea and Poor Appetite

Kidney disease can cause nausea, stomach irritation, changes in taste and food aversion. A pet may approach food but turn away, lick the lips, drool, swallow repeatedly, grind the teeth or vomit.

Support may include:

  • Offering smaller, more frequent meals
  • Warming food slightly to increase its aroma
  • Rotating among appropriate foods and textures
  • Using separate dishes for food and medication
  • Addressing constipation, reflux or mouth discomfort. Adored Beast Gut Soothe or Adored Beast Feline Gut Soothe are good holistic options.
  • Providing veterinarian-prescribed anti-nausea or appetite-support medication when needed. For holistic options  our diarrhea and vomiting page for nausea and our weight issues pages for appetite support. 
  • Using acupuncture, acupressure or veterinarian-approved herbal support

Maintaining calorie intake is extremely important. A “perfect” kidney diet offers little benefit when a pet refuses to eat it. During a poor-appetite episode, getting the pet to eat an acceptable food may temporarily take priority while the underlying nausea or discomfort is addressed.

Cats should receive prompt veterinary attention when they stop eating because prolonged food refusal can lead to additional serious complications.

Controlling Phosphorus

As kidney function declines, phosphorus can accumulate in the blood and contribute to further kidney damage and mineral imbalance. Dietary phosphorus control is therefore an important part of managing many pets with chronic kidney disease.

Fresh food is not automatically low in phosphorus. When possible, obtain the phosphorus content of the diet and evaluate it alongside the pet’s kidney stage and blood phosphorus level. (See our diet recommendations below). 

If dietary changes are not enough, a veterinarian may recommend a phosphate binder. Binders must be given with meals because they work by binding phosphorus in food before it is absorbed. The product and amount should be selected according to the pet’s diet and laboratory results.

Preserving Muscle With Appropriate Protein

Kidney patients need high-quality, digestible protein to maintain muscle, strength, immune health and normal body functions. Excessive protein restriction can contribute to muscle wasting, weakness and poor appetite, particularly in senior pets.

Protein needs should be individualized according to:

  • Kidney stage
  • Protein loss in the urine
  • Blood values
  • Muscle condition
  • Appetite
  • Activity level
  • Other medical conditions

The goal is generally to provide enough high-quality protein to preserve lean muscle while controlling phosphorus and minimizing symptoms associated with the accumulation of metabolic waste.

Managing High Blood Pressure and Proteinuria

High blood pressure can damage the kidneys, eyes, brain and heart. Kidney disease can also cause or worsen hypertension, creating a cycle of continued damage.

Proteinuria occurs when damaged kidney filters allow excessive protein to pass into the urine. Persistent protein loss may contribute to kidney disease progression.

Management may include:

  • Regular blood-pressure checks
  • Urine protein-to-creatinine testing
  • Omega-3 fatty acids when appropriate
  • Dietary adjustments
  • Stress reduction before blood-pressure testing
  • Medication when prescribed

Blood pressure and urine protein should be monitored even when a pet appears to feel well.

Correcting Potassium, Vitamins and Other Imbalances

Kidney disease can disrupt potassium, phosphorus, calcium, acid-base balance and red blood cell production. Because these problems cannot always be identified by outward symptoms, regular testing is important.

Depending on the individual pet, support may include:

  • Potassium supplementation
  • B-vitamin support
  • Treatment for anemia
  • Correction of excessive acidity in the blood
  • Phosphate binders
  • Iron or other targeted nutritional support

These products should not be given automatically. Both deficiencies and excesses can be harmful, so supplementation should be based on laboratory results whenever possible.

Digestive and Microbiome Support

Kidney disease affects more than the kidneys. Nausea, constipation, appetite changes and an imbalanced gut microbiome can all affect a pet’s comfort and nutritional status.

Holistic digestive support may include:

Digestive products should be introduced one at a time so tolerance can be evaluated. Giving too many supplements at once can increase digestive upset and make it difficult to determine which product is helping.

Herbs, Mushrooms and Natural Support

Herbs and medicinal mushrooms may be included as part of a whole-pet kidney plan. Options commonly used by holistic practitioners include nettle, rehmannia, astragalus, Cordyceps and Reishi.

Depending on the individual pet, natural support may be used to promote:

  • Healthy circulation
  • Immune balance
  • Antioxidant protection
  • Energy and vitality
  • A healthy inflammatory response
  • Appetite and digestion
  • Overall comfort

Herbs and mushrooms should be selected according to the pet’s kidney stage, symptoms, medications and other health conditions. Products intended to “cleanse” or “detox” the kidneys should not be added automatically, particularly in advanced kidney disease.

Pets with kidney disease should avoid Chaga mushrooms because they can be naturally high in oxalates.

Acupuncture and Other Integrative Therapies

Acupuncture, acupressure, gentle massage, Reiki and other integrative therapies may complement veterinary treatment. Depending on the pet, these therapies may help support:

  • Appetite
  • Nausea management
  • Relaxation
  • Mobility
  • Circulation
  • Comfort
  • Emotional well-being

These therapies do not replace appropriate kidney treatment, but they may become valuable parts of a compassionate whole-pet care plan.

Monitoring at Home

Pet parents often notice subtle changes before they appear during an examination. Keeping a simple daily record can help identify changes early.

Monitor:

  • Appetite
  • Water consumption
  • Urination
  • Vomiting or nausea
  • Stool quality and constipation
  • Body weight
  • Muscle loss
  • Energy
  • Mobility
  • Sleep and restlessness
  • Interest in family activities
  • Overall quality of life

Contact the veterinarian promptly if the pet stops eating, repeatedly vomits, becomes severely weak, appears dehydrated, produces very little or no urine, has difficulty urinating or develops neurological changes.

Ongoing Veterinary Monitoring

Kidney disease can change over time, even when a pet appears stable. Follow-up testing may include:

  • BUN, creatinine and SDMA
  • Phosphorus, potassium and calcium
  • Complete blood count
  • Urinalysis and urine-specific gravity
  • Urine protein-to-creatinine ratio
  • Blood pressure
  • Urine culture when infection is suspected
  • Body weight and muscle-condition assessment

The frequency of monitoring depends on the kidney stage, symptoms and response to treatment.

A balanced kidney plan combines appropriate medical care with fresh nutrition, hydration, carefully selected natural support and compassionate attention to the pet’s daily comfort. Supporting the whole pet—not just the laboratory results—is at the heart of holistic kidney care.

Best Diet for Kidney Disease in Dogs and Cats

Diet Recommendations:

There is no single diet that is appropriate for every dog or cat with kidney disease. Phosphorus is often one of the most important nutrients to monitor, but protein, potassium, sodium, calories and fat may also need adjustment. Dietary decisions should be based on the pet’s kidney stage, laboratory results, muscle condition, appetite and other medical conditions.

Severe protein restriction is not automatically appropriate for every kidney patient. The goal is generally to provide enough high-quality, digestible protein to preserve muscle while controlling phosphorus and reducing the buildup of metabolic waste. Needs may change as kidney disease progresses.

  1. Solutions Pet Products Urinary and Heart Restorative Diet (5% off this URL)
  2. Raised Right Veterinary Kidney Support Recipes for Dogs (20% off the first 16 bags of food with coupon: PETS20)
  3. Goodness Gracious Rabbit or Turkey (dogs and cats)
  4. Dr. Harvey’s Raw Vibrance
  5. Medicus Kidney Diet for Dogs (10% coupon: SAVINGPETS)
  6. Medicus Kidney Diet for Cats (10% coupon: SAVINGPETS)
  7. Goodness Gracious Zhi Low Phosphorus Kidney Recipe for Cats

 

Kidney diets are not one-size-fits-all. The best choice depends on the cat’s IRIS stage, blood phosphorus and potassium levels, protein loss, appetite, body weight and muscle condition. Whenever possible, ask the manufacturer for phosphorus expressed as grams per 1,000 kcal, rather than relying only on the as-fed percentage. Cats that are nauseated or refusing food should not be allowed to go without eating while searching for the perfect kidney diet.

 
 
recommended kidney diets dogs and cats lr
LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Kidney Support Diet for Dogs,” a FREE pdf download.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Dr. Judy Morgan’s Kidney Support Diet for Cats,” a FREE pdf download.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade):  “Kidney Support Slow Cooker Cod Recipe.”

Holistic Kidney Support for Dogs and Cats

Holistic kidney care supports the whole pet rather than focusing only on bloodwork. Fresh nutrition, hydration, digestive health, stress reduction, gentle movement and carefully selected natural therapies can work alongside veterinary treatment to support comfort and quality of life.

Herbs and medicinal mushrooms should be chosen according to the pet’s IRIS stage, symptoms, laboratory results, medications and other health conditions. A product that is helpful for one kidney patient may not be appropriate for another.

Herbs for Kidney Support

Herbal medicine has long been used to support kidney function, circulation, fluid balance, digestion and overall vitality. Some herbs may also provide antioxidant and anti-inflammatory support.

Kidney-support herbs are often most effective when they are selected for the individual pet rather than used as a one-size-fits-all “kidney cleanse.” Pets with advanced kidney disease may have more difficulty processing certain compounds, so stronger formulas are not necessarily better.

Nettle

Nettle is a nutrient-rich herb traditionally used to support the kidneys, urinary tract and healthy fluid balance. It contains vitamins, minerals, antioxidants and plant compounds that may offer gentle nutritional support.

Nettle may also have a mild diuretic effect, so it should be used carefully in pets that are dehydrated, receiving subcutaneous fluids, taking diuretic medication or experiencing electrolyte imbalances.

Astragalus

Astragalus is traditionally used to support immune balance, circulation, energy and resilience. It may also provide antioxidant support and help maintain a healthy inflammatory response.

Because Astragalus can influence immune activity, it may not be appropriate for every pet with an autoimmune condition or for pets taking immune-suppressing medication. Its use should be discussed with an integrative veterinarian.

Rehmannia

Rehmannia is one of the most frequently used herbs in Traditional Chinese Veterinary Medicine for kidney and adrenal support. Depending on the formula, it may be used to support vitality, fluid balance, circulation, appetite and weakness associated with aging or chronic illness.

Rehmannia is commonly combined with other herbs rather than used alone. The best formula depends on the pet’s individual constitution and pattern of symptoms. We discuss Rehmannia and Rehmannia Eight in greater detail in the next section.

Dandelion

Dandelion leaf is traditionally used for gentle urinary and fluid-balance support, while dandelion root is more commonly associated with liver and digestive support. It also provides naturally occurring antioxidants and nutrients.

Because dandelion leaf may increase urination, it should not be used indiscriminately in dehydrated pets or those with electrolyte concerns. Dandelion may also interact with certain medications.

Marshmallow Root

Marshmallow root contains soothing mucilage that may help coat and calm irritated tissues within the digestive and urinary tracts. It can be especially useful when a kidney patient is also experiencing digestive irritation.

Because its mucilage may alter the absorption of medications or supplements, marshmallow root should generally be given separately from them. We recoommend Adored Beast Canine Gut Soothe or Adored Beast Feline Gut Soothe.

Milk Thistle

Milk thistle primarily supports the liver rather than the kidneys. However, the liver and kidneys both participate in processing and eliminating substances from the body, so liver support may be considered when a pet has elevated liver values, takes several medications or has another identified reason for needing it.

Milk thistle should not automatically be included in every kidney protocol. Its use should be based on the whole pet’s needs.

Herbal Blends vs. Individual Herbs

Kidney-support formulas often combine several herbs that work together. A professionally formulated blend may be more appropriate than combining multiple individual products without a clear plan.

Before choosing an herbal formula, consider:

  • The pet’s IRIS stage
  • Hydration and electrolyte status
  • Blood pressure
  • Protein loss in the urine
  • Liver function
  • Appetite and digestion
  • Current medications and supplements
  • Other conditions, including heart or autoimmune disease

Introduce only one new product at a time whenever possible. This makes it easier to recognize benefits, digestive upset, appetite changes or other unwanted reactions.

Using Kidney Herbs Safely

Natural does not mean risk-free. Herbs can affect blood pressure, urine production, blood clotting, immune activity, electrolytes and medication absorption.

Consult a veterinarian trained in herbal medicine before beginning an herbal protocol, especially if the pet:

  • Has Stage 3 or Stage 4 kidney disease
  • Is dehydrated or receiving subcutaneous fluids
  • Has heart or liver disease
  • Has high blood pressure
  • Has abnormal potassium or phosphorus levels
  • Takes prescription medication
  • Is pregnant, nursing or preparing for surgery
  • Has an autoimmune or immune-mediated condition

Herbs should complement appropriate veterinary care, fresh nutrition and hydration—not replace necessary testing or treatment. The goal is to provide gentle, purposeful support that helps the whole pet feel better while avoiding unnecessary stress on compromised kidneys.

Kan Essentials Rehmannia 8

Ask Dr. Steve, DVM

Kan Essentials Rehmannia 8 (also called Rehmannia Eight Combination) is a traditional Chinese herbal formula used by many holistic vets to support aging dogs and cats — especially those showing signs of kidney weakness, fatigue, or mobility changes.

It’s designed to strengthen the kidneys and adrenals, boost vitality, and help balance water and hormone regulation. In TCM terms, it “warms and nourishes Kidney Yang,” which translates to helping pets who feel cold, tired, or weak in the hind end.

Main herbs include rehmannia root, yam, poria, cornelian cherry, cinnamon, and prepared aconite — ingredients long used to support kidney and endocrine health.

It’s available as a liquid or tablet, with dosage based on body weight. Many holistic veterinarians use it alongside other therapies for chronic kidney disease, age-related decline, or adrenal imbalance.

Use with Care: It’s a warming formula, so it’s not ideal  for pets with excess heat, inflammation, or active infection. Always check with a holistic vet first, especially if your pet has liver or kidney disease, is on medication, or is very young or old.

To order send email with the following info to Aleksandra Topic.

  • Full Name and Address
  • Name of the Herb/Product
  • Option/Quantity Needed

Medicinal Mushrooms for Kidney Support in Dogs and Cats

Reishi (Ganoderma lucidum)

Reishi is valued for its antioxidant properties and its ability to support immune balance and a healthy inflammatory response. In holistic care, it may be considered for pets with chronic illness, stress or age-related decline.

Reishi may affect blood clotting and blood pressure. Use it cautiously in pets taking anticoagulants, blood-pressure medications or other products that influence clotting. It should generally be discontinued before surgery under veterinary guidance.

Cordyceps (Cordyceps militaris)

Cordyceps is traditionally regarded as a kidney and vitality-supporting mushroom. It may help support energy, stamina, oxygen utilization and a healthy inflammatory response, making it one of the more commonly considered mushrooms for pets with chronic kidney disease and fatigue.

Although promising research exists, evidence specific to dogs and cats with kidney disease remains limited. Cordyceps should complement—not replace—appropriate nutrition, hydration, monitoring and veterinary treatment.

When choosing a product, look for Cordyceps militaris fruiting body extract rather than wild Cordyceps sinensis, which is rare, expensive and frequently replaced with cultured mycelium.

Turkey Tail (Trametes versicolor)

Turkey Tail is best known for its beta-glucans and immune-modulating properties. It is more commonly used to support immune health, gut health and pets facing cancer than as a direct kidney-support mushroom.

Turkey Tail may still have a place in a whole-pet plan when immune or digestive support is needed. However, it should be selected according to the pet’s complete health picture, particularly when the pet has an autoimmune condition or takes immune-suppressing medication.

Shiitake (Lentinula edodes)

Shiitake contains beta-glucans and other natural compounds that may provide antioxidant, immune and healthy inflammatory support. It may be included in a professionally formulated mushroom blend, although it is not usually the primary mushroom selected specifically for kidney support.

Because Shiitake contains naturally occurring purines, it may not be appropriate for pets prone to urate stones or those requiring a purine-restricted diet. Its use in pets with advanced kidney disease should be discussed with a veterinarian familiar with medicinal mushrooms.

Medicinal mushrooms should be introduced gradually and chosen according to the pet’s kidney stage, medications and overall health. Whenever possible, select a properly identified, third-party-tested fruiting body extract that clearly lists its beta-glucan content. Pets with kidney disease should avoid Chaga because it can be naturally high in oxalates.

Recommended Medicinal Mushroom Products

Additional Information

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade:  “Dr. Judy Morgan’s Kidney Disease Outline,” a FREE pdf filled with information.

Adored Beast Logo

“Recognizing and Treating Kidney Disease in Cats”  by Julie Anne Lee, DCH RCSHom.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade:  “Diagnosing and Treating Kidney Disease.”

Adored Beast Logo

“Oxalates, Chaga and Kidney Issues: Should You Be Concerned?  by The Adored Beast Team.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade: “Kidney Disease – Don’t Overlook This Silent Killer.”

Dogs First logo

“Ideal Diet for Dogs with Kidney Disease. Go Fresh! Go Natural! Part 4”  by Dr. Conor Brady.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade:  “Dr. Judy Morgan’s Urinary and Kidney Resources.”

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade:  “Kidney Failure in Cats and How to Treat It Naturally.”

two crazy cat ladies logo lr

“Kidney Disease in Cats”  by The Two Crazy Cat Ladies.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade:  “AIM Therapy and Chronic Kidney Disease in Cats.”

Adored Beast Apothecary logo

“Kidney Disease in Cats” by Julie Anne Lee Lee.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Kidney Disease Symptoms and Diagnosis.”

SolutionsLogoTrans

“The Truth About Phosphorus in Pet Food: What You Need to Know.”

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Staging of Kidney Disease.”

Dr.LoudonLogo

 “Understanding and Managing Kidney Disease in Dogs”  by Dr. Lynda Loudon.

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Kidney Failure: Irreversible?”

Natural Pete Doctor

“Kidney Disease, Diet and Natural Remedies in Dogs and Cats with Dr. Katie – The Natural Pet Doctor”

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Kidney and Urinary Conditions in Dogs.” 

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Feeding Pets with Kidney Disease.” 

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Diets for Pets with Kidney Disease.”

LogoWeb 471199e3 5d09 4065 b58e a87caa4b5c6e

Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Easy Homemade Dehydrated Kidney Treats.”

SavingPetsFBGroup final

If you have a question on this topic that wasn’t answered here, we invite you to ask it in our Facebook group.

Kidney Disease in Dogs and Cats: Supplement Recommendations

Kidney support should be individualized according to the pet’s diagnosis, IRIS stage, laboratory results, symptoms and current medications. The following foods and supplements are options we would consider discussing with a veterinarian or holistic practitioner. Every pet will not need every product listed.

  1. Give dogs Five Leaf Botanicals Kidney Health (10% discount for new customers: SAVINGPETS).
  2. Consider one of these herbal support products when appropriate for the individual cat or dog. Use one comprehensive formula at a time unless otherwise directed by a holistic veterinarian  (also dogs, IF you don’t use the Five Leaf Botanicals Kidney Health  above).
  3. Give a good soil based probiotic.
  4. Provide plenty of hydration.
  5. Herbsmith Kidney Care (10% coupon: SAVINGPETS)
  6. Use Adored Beast Potent Sea Omega 3 Oil or Woof Creek Omega Ocean Fish Oil for Dogs/Cats (10% off this URL)
  7. For cats: Rx Feline Renal or Standard Process Feline Renal Support.
  8. Rx Phos Bind Powder (10% off this URL)
  9. Ensure your pet is under the care of a good holistic vet. You can find one here.
  10. Pets with kidney issues should not be given chaga mushrooms.
  11. You can shop Kelly’s Kidney Picks on the SAving Pets Store (5% off at this URL)
Five Leave Botanicals Canine Kidney Health
  1. Five Leaf Botanicals Canine Kidney Health (10% coupon for new customers: SAVINGPETS)
    $150.75

    A complete, home-based herbal care system for your dog, designed to help you confidently support their Kidney function and overall vitality, backed by decades of experience.

    Buy Now

    We earn a commission if you make a purchase, at no additional cost to you.

  2. Raised Right Veterinary Kidney and Pancreatic Support Recipes for Dogs

    20% off the first 16 bags of food using coupon code: PETS20. Price varies based on quantity purchased.


    We work with veterinarian Dr. Karen Becker to formulate whole food recipes that are high in protein & low in carbs with limited ingredients. Most of our recipes have less than 2% carbs because we don’t use any high carb fillers like potato, rice, oats, yam, squash, pasta, or barley. Many of our recipes are formulated to meet AAFCO’s requirements for a complete & balanced diet through using ONLY whole foods without any synthetic vitamins and minerals.

    Veterinarians are recommending our recipes as a source of nutrition beneficial to healthy dogs & cats as well as pets with a variety of health issues. We were recognized by the Innovative Veterinary Care Journal for the impact our recipes are making in the lives of dogs & cats by being awarded the 2019 Innovation Award for Nutrition.

    Buy Now

    We earn a commission if you make a purchase, at no additional cost to you.

Saving Pets Store Logo lr

5% off everything in the Saving Pets Store. 

SavingPets LinkTree Store lr

Shop our kidney recommendations on Linktree.

The Outlook

Many dogs and cats with chronic kidney disease can continue to enjoy a good quality of life with early detection, thoughtful nutrition and individualized care. A holistic plan does not focus only on lowering laboratory values—it supports hydration, nourishment, digestion, comfort, emotional well-being and the pet’s ability to enjoy daily life.

Kidney needs can change over time, so food, supplements, fluids and medications may need to be adjusted as the disease progresses. Working with a veterinarian, holistic or integrative veterinarian and veterinary nutritionist can help create a balanced plan that supports the whole pet.

Frequently Asked Questions About Kidney Disease in Dogs and Cats

Early signs often include increased thirst, increased urination, mild weight loss, nausea, or decreased appetite. In cats, subtle weight loss and muscle wasting may appear before obvious symptoms.

No. While prescription diets are commonly recommended, many pets benefit from moisture-rich, minimally processed diets with controlled phosphorus and moderate high-quality protein. Individual lab values should guide dietary decisions. We do not recommend prescription diets. See our prescription diet page for more information.

Acute kidney injury can sometimes improve with early intervention. Chronic kidney disease (CKD) is typically progressive, but proper diet, hydration, and targeted supplementation can slow progression and improve quality of life.

Related Infographics

We encourage you to download and share these graphics for personal use and on social media, if desired. However, please note that these graphics cannot be altered in any manner, and you are not authorized to present them as your original creations.

The graphics presented herein are the intellectual property of the identified original creators, used with permission here, or are the result of our own development. Any use for resale or commercial purposes requires explicit written consent from the content creators.

feline kidney disease lr
Holistic approach to kidney disease in dogs and cats
Tips for pets with kidney disease
recommended kidney diets dogs and cats lr
Kan Herbs Order form lr
medicinal mushrooms pets lr
dr morgan constitution diets lrj.peg
excess and deficiency lr
dandelions lr
Yogurt lr
Kidney Disease in dogs and cats IRIS Staging freamework for kidney disease
Five Leave Botanicals Canine Kidney Health

Related Topics

Theme image of a jar of coins with a heart growing out of it.

Have we helped?

We’ve poured our hearts into creating this website for you, and we’re still bustling with excitement to keep it going! As a team of volunteers, we’re using our own resources to bring this information to life. There are many ways you can show your support for our efforts. We greatly appreciate it! If we’ve been able to help you on your journey to a healthier pet, we would love it if you consider showing your support.