Veterinary Diets for Cats: Why Your Vet May Recommend One

Veterinary diets for cats help manage certain health conditions because they have different ingredients or amounts of particular nutrients. For example, a therapeutic food for cats with hyperthyroidism contains very little iodine, which the body needs to make thyroid hormone. In contrast, regular cat foods are designed to meet the nutritional needs of healthy cats.  

Only certain cats will benefit from eating a veterinary diet, and some cats can actually be harmed if they are fed ones that they don’t need. This is why you should only feed your cat a therapeutic diet that has been recommended by your veterinarian.  

Veterinarians recommend therapeutic diets for cats as a part of the treatment plan for many different health concerns. 

Cats with urine crystals, bladder stones, or feline idiopathic cystitis, may benefit from a veterinary urinary diet.  

Foods like Purina Pro Plan Veterinary Diets UR Urinary St/Ox create an environment that’s less favorable to crystal and stone formation and help keep urine dilute. 

Veterinary diets can improve quality of life and longevity in cats diagnosed with chronic kidney disease.  

Royal Canin Veterinary Diet Adult Renal Support D and similar foods typically have a moderate amount of high-quality protein and reduced levels of phosphorus along with omega-3 fatty acids and antioxidants.  

Cats with gastrointestinal problems, such as vomiting or diarrhea, may also benefit from a veterinary diet.  

Foods like Hill’s Prescription Diet i/d Digestive Care are often made with highly digestible ingredients and contain specific types of fiber to support the gut microbiome and improve stool quality. 

Veterinarians will often prescribe cats with food allergies a therapeutic diet made with hydrolyzed protein or a novel protein source that won’t trigger an immune response.  

Hill’s Prescription Diet z/d is made with hydrolyzed protein, while Blue Buffalo Natural Veterinary Diet NP Novel Protein Alligator Grain-Free Dry Cat Food is a good example of a novel-protein veterinary diet. 

Veterinary cat foods for weight-management are formulated to help overweight and obese cats lose weight quickly and safely. Simply feeding less of a cat’s regular food can lead to extreme hunger, nutrient deficiencies, and loss of muscle mass.  

Foods for weight loss, like Purina Pro Plan Veterinary Diets OM Overweight Management, tend to be relatively low in fat and calories and high in fiber and protein.  

Veterinary diets for cats are also available for other conditions, including: 

• Diabetic support  
• Cognition and joint support 
• Fearful behavior 
• Dental care  
• Hyperthyroidism  
• Recovery 

Your veterinarian can recommend the best veterinary diet based on your cat’s specific needs. 

Veterinary diets can be very helpful, but they’re not right for every cat or under all circumstances. Let’s look at the major differences between veterinary diets and regular cat foods. 

Veterinary diets are not automatically higher-quality or healthier. For the right cat, they can do a lot of good, but given to the wrong cat, they aren’t beneficial and can even be harmful. 

Pet parents need to have a veterinarian’s authorization before they can purchase a veterinary diet.  

Your vet may be able to sell you the food they’re recommending or give you a prescription that you can take to a local pet supply store.  

In most cases, online retailers can directly contact your veterinarian for approval if you provide their contact information during check out.  

The right veterinary diet depends on your cat’s diagnosis, their age, and overall health. A veterinarian who is familiar with your cat’s case is in the best position to recommend a specific diet and monitor how your cat responds to it.  

Follow your veterinarian’s guidance when switching your cat to a new veterinary diet. In many cases, a gradual transition is best, but there are exceptions depending on your cat’s medical condition. 

1. Follow your veterinarian’s feeding instructions. Some cats should transition gradually, while others may need to start their new food right away.  
2. Gradually mix in the new food. If your veterinarian recommends a slow transition, increase the amount of the new food while decreasing the old food over the course of one to two weeks. This gives your cat’s digestive system time to adjust and may make them more willing to accept the new diet.  
3. Encourage your cat to eat. If needed, try soaking dry food in a little warm water or warming wet food slightly to make it more appealing.  
4. Monitor your cat’s appetite. If your cat isn’t eating well after a day or two, contact your veterinarian. There are often several veterinary diets available for the same condition, and your vet may recommend a different flavor, texture, or brand. 

Cats on a veterinary diet should not be given human foods, supplements, treats, other cat foods, and toppers unless a veterinarian says it’s OK to do so.  

Because these diets are so carefully formulated, adding anything else, even in small amounts, may interfere with how well the diet works.  

How long a cat needs to stay on a veterinary diet depends on what health problem is being managed and how well the cat responds to the food.  

Some cats may only need to eat a veterinary diet for a few days or weeks while they are recovering from an acute illness, but cats with chronic conditions often need to stay on a vet-recommended cat food for life.  

Yes. Veterinary diets are formulated to manage specific health problems, so a veterinarian has to provide authorization before you can purchase them.  

It depends. Some veterinary diets can harm a healthy cat while others simply wouldn’t be beneficial. Avoid feeding therapeutic food to a healthy cat unless your veterinarian says it’s safe. 

Not necessarily. Veterinary diets are formulated to help cats with specific health problems, not to be better than regular food for healthy cats. 

Only if a veterinarian says it’s OK. Adding regular food can add unwanted ingredients or change the specific nutrient profile that makes a veterinary diet effective. 

Talk to your veterinarian. They can recommend a different flavor, texture, or brand that will have a similar effect, or suggest strategies that will encourage your cat to eat.