Did you know that “prescription diet” doesn’t mean prescription medication? These veterinary diets are specially formulated pet foods, and most are not FDA-approved animal drugs. They are designed for specific health conditions and are typically sold under veterinary direction. But that doesn’t mean every formula is the best choice for every dog or cat. Let’s look beyond the marketing, examine the ingredients and nutritional approach, and explore whether other options may better meet your pet’s individual needs.
Why do vets recommend prescription diets?
Not because they are healthy for your pets! Vets are heavily influenced by pet food and pharmaceutical manufacturers while in vet school. Vet students get their prescription pet food for a fraction of the cost, the brands give them backpacks, books, school supplies, t-shirts all imprinted with their logos. The pet food manufacturer nutritionists teach the nutrition training.
When they graduate they also get paid for every bag or can they sell in their office. They are indoctrinated early in their career and their loyalty was bought to recommend food that is not nutritious.
It benefits the vet, not the pet!
According to state regulators, the term “prescription diet” refers to that products freedom to make medical claims – this freedom isn’t earned in the sense of verified outcomes, feeding trials, or nutrient analysis. “Prescription diet” is little more than a very expensive marketing term.
Hills Science Diet, Purina, Royal Canin and other companies that offer prescription diets offer them for a multitude of medical conditions. Usually, the only thing different about each of these diets is the packaging and 1-2 ingredients.
There is nothing “prescription” in the diet.
The term “prescription diet” can be confusing because these products are pet foods, not the same thing as prescription medications. Veterinary or therapeutic diets are specially formulated to provide particular nutritional characteristics for dogs and cats with certain health conditions, such as kidney disease, urinary problems, gastrointestinal disorders like pancreatitis or irritable bowel syndrome, food sensitivities, diabetes, or obesity.
The regulatory picture is a little unusual. The FDA explains that complete pet food diets intended to treat or prevent disease can be regulated as foods, drugs, or both depending on their intended use and claims. Most complete diets marketed for treating or preventing disease are not FDA-approved animal drugs. The FDA nevertheless recommends that these diets be made available through veterinarians or under veterinary direction because they are formulated for specific health needs and may not be appropriate for every pet.
That is different from an FDA-approved prescription animal drug. Approved prescription drugs go through an animal-drug approval process and are required to carry specific labeling identifying them as FDA-approved.
Veterinary diets can still have legitimate nutritional purposes. For example, a kidney diet may modify phosphorus and other nutrients, while a urinary diet may be formulated to influence characteristics of the urine. The important question isn’t simply whether a food carries the words prescription or veterinary diet on the package. We encourage pet parents to look at the entire formulation, ingredients, nutrient profile, their pet’s individual condition, and the evidence supporting the diet’s intended use. There are holistic pet food options which are more nutritious for your dogs or cats that are more affordable. Search this website for your medical conditions and read our diet recommendations.
A veterinary diet may be appropriate for some pets, but it isn’t automatically the only nutritional option available. Throughout this page, we’ll look more closely at these foods, why veterinarians recommend them, what’s in some commonly recommended formulas, and other options pet parents can discuss with their veterinarian.
Veterinarians often recommend prescription or therapeutic diets because they are formulated with specific nutrient profiles designed to help manage certain medical conditions. Depending on the diet, this may include altered levels of protein, phosphorus, sodium, fat, fiber, minerals, or other nutrients.
For example, veterinary diets may be formulated to support dogs and cats with kidney disease, urinary crystals or stones, gastrointestinal disorders, pancreatitis, food sensitivities, diabetes, or weight-management needs. Some therapeutic diets have also undergone feeding trials or clinical research for their intended nutritional purpose.
Veterinarians may recommend these foods because they provide a convenient, standardized way to control specific nutrients without requiring pet parents to formulate a therapeutic diet themselves. For some pets—particularly those with complex medical conditions—this nutritional management can be an important part of their overall treatment plan.
However, recommending a veterinary diet doesn’t necessarily mean that a particular brand or formula is the only appropriate option. Different pets have different nutritional needs, tolerances, medical histories, and food preferences.
We encourage pet parents to ask why a particular diet is being recommended, which nutrients are being modified, what the diet is intended to accomplish, and whether other appropriate food options are available.
The goal shouldn’t simply be to feed a food because the label says “prescription” or “veterinary.” The goal is to understand what nutritional changes your pet needs and why so you and your veterinarian can make an informed decision about the best way to provide them.
For an eye opening education on pet food, watch the Pet Fooled Documentary on YouTube for free.
Many of the companies behind prescription diets operate within a narrow, reductionist framework — one that often prioritizes symptom management over true healing. For example, if digestive issues like diarrhea can be managed with a food made mostly from corn starch, and that food is cheap to produce but sold at a high markup, there’s little financial motivation to innovate. As long as it meets basic nutrient guidelines, it’s considered acceptable. But masking symptoms doesn’t address root causes. Over time, this can lead to chronic conditions that require ongoing medication, keeping pets — and their owners — trapped in a cycle that doesn’t truly restore health.
All in all, we believe that nutrient dense whole foods, regular exercise, balanced gut health, and positive energy are more effective than any “prescription” pet food when it comes to enabling deep healing. The evidence is compelling and the science is sound. As we continue to develop our research in collaboration with veterinarians, scientists, farmers, and other leaders in this space, we welcome you to share in our journey to bring about true solutions to this disease culture we are embedded in.
“Prescription pet food” is often marketed as science-backed, but much of that science is driven by the same companies profiting from the products. It’s smart marketing — and it works, especially on well-meaning pet parents who trust their vet’s advice without question.
But here’s the truth: you are your pet’s best advocate. Not the vet. Not the brand. You owe it to your animal to understand what’s actually in their food — and how those ingredients affect long-term health.
If you haven’t already, watch the documentary PET FOOLED. It’s a powerful starting point for seeing what’s really behind the label.
Your pet depends on you. And once you start learning, there’s no going back.
At Saving Pets One Pet At A Time, we do not recommend conventional prescription diets. While these foods are formulated to modify specific nutrients for certain medical conditions, we believe pet parents should look beyond the therapeutic label and carefully examine the actual ingredients, processing methods, and overall nutritional quality of the food. Read our How to Read A Pet Food Label Like a Pro blog.
Many conventional veterinary diets are highly processed kibble or canned foods. Depending on the individual formula, ingredient lists may include refined starches, grains, plant proteins, by-products, isolated vitamins and minerals, cheap fillers, gums, flavorings, and other highly processed ingredients. Some formulas also rely heavily on carbohydrates or plant-based ingredients rather than fresh animal-based foods.
From a holistic nutrition standpoint, we question whether simply modifying one or two nutrients while continuing to feed a highly processed diet is always the best long-term approach. Meeting a therapeutic nutrient target and providing optimal whole-food nutrition are not necessarily the same thing.
This is why we encourage pet parents to turn the bag or can around and read the ingredient panel and nutritional information. Ask what makes the food appropriate for your pet’s condition. Is it lower phosphorus? Reduced fat? Controlled minerals? A hydrolyzed protein? Increased fiber? A particular urinary mineral profile? Understanding the nutritional goal makes it easier to explore whether that same goal can be achieved with a higher-quality, less processed diet.
Whenever medically appropriate, we favor properly formulated fresh-food diets using whole-food ingredients, including raw or gently cooked options, rather than automatically reaching for a conventional prescription diet. The diet still needs to be specifically formulated for the medical condition—a dog with pancreatitis, for example, has very different nutritional requirements from a cat with kidney disease or a dog prone to certain urinary crystals and stones.
Fresh feeding also doesn’t mean simply putting meat and vegetables in a bowl. Therapeutic fresh diets must be nutritionally complete and appropriately formulated, particularly when they are being used to help manage disease.
Our goal is to encourage pet parents to ask more questions, understand what their pet actually needs nutritionally, and work with a veterinarian or qualified veterinary nutrition professional who is open to fresh, individualized nutrition rather than assuming a prescription kibble is the only option. Please read our Choosing a Vet page to learn more about how little training your vet has on nutrition and also our veterinary referral page to find a new integrative vet.
Yes. A conventional prescription diet is not necessarily the only way to provide specialized nutrition for a dog or cat with a medical condition.
At Saving Pets One Pet At A Time, we prefer fresh, minimally processed nutrition whenever it can be safely and appropriately formulated for the individual pet. Depending on the condition, this may include a balanced raw diet, gently cooked food, or a properly formulated homemade diet.
The key is understanding what the prescription diet is trying to accomplish nutritionally and addressing those same needs with a fresh-food approach.
For example, a pet may require:
One of the biggest advantages of fresh feeding is the ability to individualize the diet. Instead of choosing from a limited number of commercial therapeutic formulas, the ingredients and nutrient profile can be adjusted to the needs of the individual dog or cat.
However, therapeutic fresh feeding requires more precision than simply choosing healthier ingredients. Raw, gently cooked and homemade diets used for pets with medical conditions should be properly formulated so that essential nutrients are provided while the nutrients relevant to the disease are appropriately controlled. See our Pet Food Recommendations by Medical Conditions.
Are you looking for a pet nutritionist or holistic pet coach?
For us, the question isn’t simply, “Which prescription food should I buy?” It is:
“What does my pet’s body need nutritionally, and what is the healthiest way we can provide it?”
Many pet parents wonder why Hill’s, Purina, and Royal Canin veterinary diets are so frequently recommended by veterinary clinics. One important piece of the picture is the relationship between major pet food manufacturers and veterinary education.
Large pet food companies—including Hill’s Pet Nutrition, Purina, and Mars, which owns Royal Canin—have longstanding relationships with the veterinary profession. They provide nutrition education, educational materials, research funding, student programs, continuing education, and other resources within veterinary medicine. As a result, veterinarians may become familiar with these companies and their therapeutic diets during their education and throughout their careers.
Veterinary clinics may also sell prescription diets directly to clients and earn revenue from those sales, just as they do from many other products and services offered through the practice. That financial relationship is worth understanding, but it does not mean every veterinarian receives a personal commission or recommends a particular food because of financial incentives. Compensation arrangements vary among veterinary practices.
At Saving Pets One Pet At A Time, we believe veterinary nutrition education should include a much broader discussion of fresh, raw, gently cooked, and appropriately formulated homemade diets, rather than relying predominantly on conventional commercial therapeutic foods.
Veterinarians often recommend these diets because they are familiar with them and because the formulas provide predictable nutrient profiles for specific medical conditions. But familiarity with a therapeutic food does not necessarily mean it is the only—or, in our view, the most nutritious—way to meet those nutritional targets. Also, most vets have on average only four hours of nutrition training taught by Hills, Purina and MARS in vet school. Vist our Choosing a Vet page to find more information.
We encourage pet parents to ask what specifically needs to change in their pet’s diet. Does phosphorus need to be controlled? Does fat need to be reduced? Does a particular mineral need to be adjusted? Is a novel or hydrolyzed protein necessary?
Once you understand the nutritional goal, you can have a much more meaningful conversation about whether it can be achieved through a properly formulated fresh-food approach rather than automatically assuming a conventional prescription diet is the only choice.
The prescription and veterinary diet market is dominated by several large pet food companies, including Hill’s Prescription Diet, Royal Canin Veterinary Diet, and Purina Pro Plan Veterinary Diets. These companies produce formulas marketed for dogs and cats with conditions such as kidney disease, urinary problems, gastrointestinal disorders, food sensitivities, diabetes, obesity, and other health concerns.
At Saving Pets One Pet At A Time™, we do not recommend conventional prescription diets. My dog and thousands of other pets died or got very sick from them. We believe pet parents should understand exactly what is in these foods and why each ingredient is being used rather than assuming a food is nutritionally superior simply because it is sold through a veterinarian or labeled as a veterinary diet. Learn how to interpret a pet food label like a pro.
Many pet parents are surprised when they read the ingredient panel. Depending on the formula, veterinary diets may contain highly processed ingredients, substantial amounts of starch, cheap fillers, by-products, isolated nutrients, synthetic vitamins or other ingredients they may not expect in a food marketed for a medical condition.
Our approach is different. Whenever medically appropriate, we prefer fresh, minimally processed, species-appropriate nutrition, including properly formulated raw or gently cooked diets tailored to the individual animal and the condition being managed.
That doesn’t mean simply replacing a prescription food with meat or an unbalanced homemade recipe. Conditions such as kidney disease, pancreatitis, urinary crystals and stones, diabetes, and certain gastrointestinal disorders require specific nutritional modifications, and getting those modifications wrong can make a pet’s condition worse.
Before choosing any therapeutic diet, we encourage pet parents to ask:
Food should be chosen for the individual pet—not simply because a particular brand is labeled “prescription.”
Despite the name, most “prescription” or veterinary therapeutic diets are not prescription medications. They generally do not contain prescription drugs, and most have not gone through the FDA’s animal-drug approval process.
However, many therapeutic diets are intentionally distributed through veterinarians or sold with veterinary authorization because they are formulated for specific medical conditions. The FDA has historically exercised enforcement discretion for certain complete diets marketed for disease-related purposes when they are sold through or under the direction of a licensed veterinarian.
This is an important distinction: requiring veterinary authorization to purchase a food does not make that food an FDA-approved prescription drug.
Some therapeutic diets and condition-specific foods are also available without veterinary authorization. But we don’t recommend choosing a food simply because it is labeled for kidney, urinary, gastrointestinal, weight-management, or another medical condition.
At Saving Pets One Pet At A Time, we encourage pet parents to start with the nutritional requirements of the individual animal rather than the marketing category of the food. If your pet needs restricted phosphorus, controlled fat, increased moisture, a particular mineral balance, or another therapeutic modification, those nutritional requirements still matter whether you choose a commercial veterinary diet or a properly formulated fresh-food alternative.
Our preference is to explore fresh, minimally processed, species-appropriate nutrition whenever medically appropriate, while making sure the diet is properly formulated for the condition being managed. Visit our pet food recommendations by Medical Conditions page.
The goal isn’t simply to find a food you can purchase without a veterinarian. It’s to understand what your pet needs and provide those nutrients in the healthiest form possible.
“⚠️Caution: Prescription Pet Food for Allergies!?! Why You Should AVOID IT” by Dr. Judy Morgan and Dr. Conor Brady.
“Prescription Pet Foods?” by Chelsea Kent and Dr. Doug Kneuven.
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Prescription Diets⚠️Myths vs Facts💰What to Know Before Buying”
“BEST Dog Food & TRUTH About Prescription Diets From a Vet” by Rachel Fusaro.
“The Shocking Truth About Prescription Pet Food” by The Pet Parenting Reset
Different medical conditions have very different nutritional requirements. Kidney disease, pancreatitis, urinary stones and crystals, diabetes, gastrointestinal disease, and food sensitivities should not all be approached with the same type of diet.
Rather than covering each condition again here, we have created a separate guide to help pet parents understand the nutritional considerations for different health concerns.
→ Read our Pet Food by Medical Condition guide.
The short answer is NO! Let’s find out why. For healthier options that are worth the investment visit our probiotics and digestive enzyme page.
The FDA, Purina & Questions More Pet Parents Are Asking
The FDA issued a recall in February 2024 for Viva Raw for one sick pet. In contrast, this report shows 1,300 adverse events as far back as May 2023; increasing significantly in late 2023 and early 2024.
In spite of at least 1300 owners filing reports with the FDA, it dragged its heels and didn’t initiate any investigation for several months until pressured by a citizen’s petition initiated by Susan Thixton.
Even then, the investigation was minimal, sampling only a small fraction of the complaints, and not actively seeking to discover the likely toxins that were beyond their routine tests. The high-budget federal agency did less investigation than Dr. Judy Morgan and several other vets at their own expense.
Purina is a $21.5M corporation that makes major campaign contributions to those who have the power to regulate their business.
Well-informed pet owners who know how to interpret pet food ingredient labels, know there is nothing nutritious about this brand of food.
When we know better, we do better. Follow the money!
Purina FortiFlora: Your Pet Deserves Better Gut Support
Did you know that Purina Dog and Cat Food (all brands) and FortiFlora have been making pets sick?
From 12/5/23-9/1/25 in our Saving Pets One Pet @ A Time (The Original) group on Facebook we have 1848 dogs / cats (1408 dogs, and 40 cats) in USA Ireland,UK, Italy, Israel, Serbia, Hungary, France, New Zealand & Canada that are sick from Purina, 421 of which have died. The problem seems to date back to May 2023. The number continues to grow weekly.
The common denominator was they were all eating Purina. Some of the homes and rescues, and breeders have multiple pets who are impacted. This is just in one group. So we know the problem is widespread. The problem seems to date back to May 2023. I alerted 9 holistic vets and we started tracking the issues.
Our tracking showed that the concerns are with all Purina brands and now we also have many sick dogs and cats eating over 40 different cat and dog foods, and the FortiFlora probiotic. – Kelly Bone
Find out more on our Pet Food Toxicity page.
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Comparing FDA Data 2024 PET FOOD CRISIS vs 2007 Melamine Recalls Update as of 6/8/2024”
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Reporting Pet Food That Is Making Pets Sick as of 1/5/2024”
Hill’s Science Diet and Hill’s Prescription Diet are among the most frequently recommended pet foods in veterinary practices. At Saving Pets One Pet At A Time, we do not recommend Hill’s Science Diet or Hill’s Prescription Diet.
From our holistic nutrition perspective, our biggest concern is the overall formulation and heavy processing of many Hill’s foods. Depending on the specific recipe, Hill’s formulas may contain substantial amounts of grains and starches, plant proteins, animal by-products, cheap fillers, powdered cellulose, vegetable oils, natural flavors, and added synthetic or isolated vitamins and minerals.
These ingredients can provide required nutrients and help a finished food meet established nutrient profiles, but meeting minimum nutritional standards is not the same thing as providing the type of nutrition we believe is optimal for dogs and cats.
We prefer diets centered around fresh, identifiable animal proteins and whole-food ingredients with minimal processing and plenty of natural moisture. This is especially important to us when feeding cats, which are obligate carnivores and naturally obtain much of their hydration from their food.
Hill’s Prescription Diet products are formulated to manipulate specific nutrients for particular medical conditions. For example, a formula may restrict phosphorus, modify fat or fiber, use hydrolyzed protein, or control certain minerals. Those nutritional modifications can have legitimate purposes. However, the word “prescription” does not mean the food is an FDA-approved prescription medication or that the overall ingredient quality is automatically superior.
We also have concerns about Hill’s history of quality-control problems. In 2019, Hill’s recalled numerous canned dog foods after potentially toxic levels of vitamin D were discovered. The FDA reported that the recall ultimately included 86 lots representing 33 varieties of Hill’s canned dog food. Excessive vitamin D can cause serious illness, including kidney failure and death.
Following its investigation, the FDA issued Hill’s a warning letter. The agency reported that Hill’s had received a vitamin premix without obtaining the required certificate of analysis and had not tested the premix as called for by its procedures. FDA testing of samples from two recalled lots of Hill’s Prescription Diet i/d Low Fat canned dog food found vitamin D at more than 33 times the recommended safe upper limit.
That incident is one reason we encourage pet parents to think critically about foods that rely heavily on concentrated vitamin and mineral premixes. Vitamins and minerals are essential, and properly formulated commercial foods routinely use supplementation safely, but concentrated premixes require careful formulation, testing, and quality control.
At Saving Pets One Pet At A Time, we prefer properly formulated raw, gently cooked, or other fresh-food diets whenever medically appropriate. If a dog or cat has a medical condition, we believe the better question is not simply, “Which Hill’s Prescription Diet should I feed?” but:
“What nutrients does my pet’s condition require us to modify, and can we meet those needs with fresh, minimally processed, species-appropriate food?”
Our goal is not simply to meet numbers on a nutritional analysis. We want our pets to thrive on real, nourishing food.
My dog, Duncan, and thousands of other dogs and cats died in 2019 from Science Diet. Duncan died 2 weeks before the recall. Pets were sick for 7 months before the recall, and Hills did nothing about it. The recall started with 3 food products and eventually expanded to the entire product line. I was the lead plaintiff in the class-action lawsuit against Hills, which we won in 2021.
WFLA interview with Kelly
Lessons Learned From Kelly Bone
Some of Science Diet’s victims who died… we should never forget.
Here is a breakdown of one of their product ingredient label from a bio Scientist:
ingredients
“Class Action Over Prescription Pet Food Gets Green Light in Illinois” by Colleen Murphy.
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Hill’s Accused of ‘Coordinated Scheme’ to Persuade Pet Owners”
Is Royal Canin Healthy for Dogs and Cats?
Royal Canin is one of the most commonly recommended veterinary pet food brands and offers both everyday formulas and Veterinary Diet products designed for specific health conditions. At Saving Pets One Pet At A Time, Royal Canin is not a brand we recommend.
Our concern isn’t that every ingredient used by Royal Canin is inherently harmful. Rather, we question the overall nutritional approach and degree of processing when compared with the fresh, minimally processed foods we prefer for dogs and cats.
Depending on the Royal Canin formula, ingredient lists may include ingredients such as corn, wheat, rice, corn gluten meal, wheat gluten, powdered cellulose, cheap fillers, animal by-products, vegetable oils, natural flavors, and synthetic or isolated vitamins and minerals. Ingredients vary considerably between formulas, so pet parents should always evaluate the actual label of the product being considered.
Royal Canin Veterinary Diets are formulated to achieve specific nutritional goals. A urinary formula, for example, may manipulate mineral concentrations and urine characteristics, while a gastrointestinal formula may alter fat, fiber, or digestibility. Those nutritional targets can be important—but meeting a therapeutic nutrient target doesn’t automatically make the entire ingredient list one we would choose.
We also question relying heavily on ultra-processed dry food when fresh, moisture-rich nutrition may be an appropriate option. This is particularly relevant for cats, whose natural diets provide substantially more moisture than dry kibble.
At Saving Pets One Pet At A Time, we prefer properly formulated raw, gently cooked, or other fresh-food diets using recognizable whole-food ingredients whenever medically appropriate. For a pet with a health condition, however, simply switching from Royal Canin to any raw or fresh food isn’t enough. The alternative diet still needs to meet the specific nutritional requirements of that condition. Visit our pet food by medication condition page for our recommendations.
Rather than asking only, “Which Royal Canin formula does my pet need?”, we encourage pet parents to ask:
“What nutritional changes does my pet actually need, and can we provide them with fresher, less-processed ingredients?”
That’s the conversation we believe more pet parents should be having.
This is good insight into the influence that Hills (and Royal Canin and Purina) have on veterinary students during their schooling – “Buying a Vet with Dr. Laurie Coger.”
“What I learned about nutrition in veterinary school: or ‘how to read a pet food label’ “ by Josie Beug, DVM, CVA.
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Corporate Medicine: Is It in the Best Interest of Pets?”
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Decline in General Practice Skills Among New Veterinary Graduates.”
“The Surprising Truth About Prescription Dog Food”
“Prescription Diets for Pets: Safe or Just Clever Marketing?” by Dr. Andrew Jones, DVM.
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Rx Pet Food.”
Dr. Judy Morgan (2025 Holistic Veterinarian of the Decade): “Eliminate Prescription Diets By Feeding Whole Foods.”
No. Prescription diets are not medications and do not contain drugs that treat or cure disease. The term “prescription” is a marketing label used by pet food companies. These diets are still processed pet foods, though they are often formulated to target certain symptoms or nutritional profiles.
Many veterinarians recommend prescription diets because they are heavily marketed through veterinary schools and clinics, and some pets may temporarily improve on them due to ingredient restriction or altered nutrient levels. However, there are often fresh food or less processed alternatives that may better support long-term health and overall wellness.
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