ROYAL CANIN VETERINARY DIET Adult Ultamino Dry Cat Food, 5.5-lb bag -

Royal Canin Veterinary Diet Adult Ultamino Dry Cat Food, 5.5-lb bag

By Royal Canin Veterinary Diet
Rated 4.2105 out of 5 stars
Veterinary Diet Item
$69.99Chewy Price
$66.49Autoship Price
(Save an extra 5%)

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About This Item


  • A veterinary-exclusive dry cat food for adult cats with food sensitivities needing a short-term elimination diet or long-term nutrition.
  • Clinically tested to help reduce skin reactions that may be due to sensitivities to common proteins found in pet foods.
  • Minimizes the risk of reaction with proteins extensively broken down to a size that’s virtually unrecognizable by the immune system.
  • Reinforces the skin barrier with specific nutrients to support healthy skin in cats with skin sensitivity and irritation.
  • Helps support healthy digestion with an exclusive blend of fibers.

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Nutritional Information

Feeding Instructions


Play Video: Learn More About Royal Canin Veterinary Diet From Our Team of Experts
Learn More About Royal Canin Veterinary Diet From Our Team of Experts

About Royal Canin Dermatology For Cats

Worried About Your Cat’s Skin Health?

Skin health concerns are common and can appear anywhere on your cat’s body. Your veterinarian is the expert on your cat’s health, so you should always consult with this trusted advisor to find the best solutions for your pet. This specialized expertise is why Royal Canin works closely with veterinarians to develop formulas that support skin health.

Common Causes of Skin Health Concerns

Environmental Sensitivities

Pollen, plants and dust are environmental factors that can trigger an immune response in some cats.

Food Sensitivities

Your veterinarian may recommend a diet elimination trial to help determine if your pet has a sensitivity to certain proteins in his current diet.


Your cat can pick up external parasites such as mites, fleas, ticks and lice from contaminated sources, both indoors and out.


Kittens, older cats, and cats that have recently been ill may be more susceptible to bacterial infections that can lead to skin health concerns.

How Can Nutrition Help?

Your veterinarian may recommend a Royal Canin Dermatology formula for your cat. These special formulations can:

Aid digestive health by regulating movement through the GI tract and supporting balanced digestive flora

Support the skin’s natural protective barrier

Aid cellular health with a complex blend of antioxidants.

Promote healthy skin and coat by providing long chain omega-3 fatty acids in the diet

Find The Perfect Balance

With a dry and wet feeding routine, dry food supports positive oral health while wet food supports healthy hydration.


Keep your pet's feeding on schedule.  Set your order for Autoship to make sure you always have their veterinarian-recommended nutrition on hand.

About Royal Canin

What sets Royal Canin apart is their close collaboration with veterinarians. Through these professional partnerships, they strive to learn everything they can about pet health, including how different formulas perform for different breeds, sizes, lifestyles and therapeutic conditions. Ongoing research and development allows Royal Canin to keep providing the precise nutrition cats need for a range of medical conditions.

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Questions & Answers

19 Customer Questions

Any idea when this will be available again?
Answer by CrisFeb 25, 2022
So I went online (not through the app) and they have different size bag options there. I was able to order it that way. Hope this helps.

What is a good alternative to buy while this is out of stock?
Answer by CatloverJun 24, 2022
I use the hydrolized protein when all else fails and there is no stock, but my cat was on it before, that may be a vet question though. Hope this helps!

I have one cat who has been prescribed this food. Is it safe for my other cat who has no issues? He is male and I worry. Unfortunately they have grown up eating with each other and it's extremely difficult feeding them separately. Thank you!
Answer by ChewyMay 28, 2019
As this is a prescription food formulated to meet specific diet restrictions from known health issues, this food should not be fed to any other animal than the one prescribed due to the restriction of specific nutrients. Prescription diets can be detrimental to an otherwise healthy pet if that pet doesn't have the ailment for which the food is designed.

How does this blend differ from the Hydrolyzed Protein?
Answer by ChewySep 15, 2021
In the Hydrolyzed Protein HP the protein is broken down to less than 10,000 kilodaltons and can be used for IBD or food sensitivities. In the Ultamino the protein portion is broken down to the single strand amino acid resulting in a protein size of <1 kilodalton. This is a low molecular weight peptide used to support extreme cases of IBD and food sensitivities. They are both complete and balanced formulas that can be fed long term with no supplementation.

ReviewsWrite a Review

Rated 4.2105 out of 5 stars
190 Ratings
Would recommend to a friend

190 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 2 out of 5 stars
By ReubenTuesday on May 12, 2023

Fair warning before you buy...

Full disclosure, my cat never actually ate this food, so I can't speak to any health benefits from the product or its effectiveness against allergy symptoms -- but I can share a general assessment, a somewhat helpful heads-up, for other cat parents. This food came highly recommended by my veterinarian, but unfortunately, my cat absolutely *refused* to touch this stuff -- even my kitten, who will literally eat a bar of soap if left unattended, wanted nothing to do with it. Even after a week of 'slowing integrating it into their diet' the kibble remained untouched, which slightly defeats the purpose of switching your cat to a specialized diet. If the food's price-per-pound and inedibility were strikes 1 and 2, the kibbles' texture and smell was strike 3 for me. I had read another review before buying that mentioned how terribly the food smelled, but I dismissed it assuming "how bad can it honestly be?" As it turns out, it can be *very* bad... surprisingly bad. The best description of the kibble's scent would be 'wet dog with Bloody Mary mix' -- I wish I were exaggerating. The previous review had also mentioned that the kibble turned soft if left out; this is absolutely correct. I'd compare it to fresh croutons versus croutons left overnight in your salad. As for the kibble itself, these are definitely on the larger side. I can't give specific measurements but I'd gauge it's about the same size as an M&M -- I've included a phone using a dime and standard ibuprofen for comparison. All that to say, if you have cats with allergies and you buy this food, I hope it works and helps alleviate those troubles! Some folks love this food and swear by it, so it's obviously not all bad -- it just comes down to your cat and what they like.

Rated 5 out of 5 stars
By Reid on Mar 29, 2023

Miracle food for FeLV kitty!

My FeLV cat struggled with chronic diarrhea, crusty eyes, runny nose, and dandruff for YEARS. I paid hundreds (probably thousands..) on vet appointments, blood work, deworming, and fecal examinations while also trialing an elimination diet and introducing various probiotics/supplements to his diet. The vet was convinced it was just his weakened immune system from the FeLV but we trialed this food to see what symptoms could be due to any food sensitivities. A few weeks after starting this food he was a new cat. His mood improved, he gets along better with our other cat, no more chronic diarrhea, eye/nose boogies, and improved coat condition. You’d never know he had FeLV. Also he LOVES the sweet smell of the food. Our other cat also eats this food since it’s hard to keep their diets separate and does fine on it. This food is worth the price!!! Definitely recommend for those struggling with issues similar to mine. I just wish they made a wet food version! Also safe for kitties to be on this long term

Rated 2 out of 5 stars
By Meghan on Mar 26, 2023

Itchy as ever

I bought this food as a compromise to the food allergies and recent bloody diarrhea of one cat and the early renal disease of another. Unfortunately, it has only been day two and my boy is scratching like crazy. He is allergic to chicken, but I thought hydrolyzed chicken would be fine. I bought this at the advice of my vet, but a cat food with corn starch as the first ingredient sounds kind of awful. It sure does smell, as others have said, but it smells like herbs or something? Even still, our cats gobbled it right up, which is why I gave it two stars.

Rated 5 out of 5 stars
By DMG1 on Feb 27, 2023

Our Happy Cat is back

For two years we battled intestinal issues with our cat. We were on a limited ingredient veterinary diet and Tylan powder. We periodically added Proviable and things would get a little better, mainly his stool but he still did not eat much. We would then take a step back after a period of time. After lost of test and trying another good, we tried this. At first he did not want to eat it but now he loves it. With the addition of Visbiome we now have our happy boy back. His stool is normal and no more gas or stomach pain. He is one spunky little boy now.

Rated 5 out of 5 stars
By 315Jen on Jan 19, 2023

A literal lifesaver

My 16yo cat has always been petite, but she started losing weight consistently in the last year or two. I've tried different foods, and her vet ran various blood tests to find anything definitive to explain her weight loss, but to be avail. (At her heaviest, Peanut was about 10.5lbs and weighed in at just over 7lbs when I got the prescription for this food.) Before Ultamino, I could feel Peanut's ribs and hips when I pet her, she had very low energy and slept all the time, her poops were very dark and horribly smelly, and she threw up a LOT (I'm talking daily). Just one month of being on Ultamino, she put on weight (she attacked this food from the word go, and has a voracious appetite now!), I can barely smell after she uses the litter box, the vomiting has almost completely ceased, she's venturing all over the apartment, she'll bring me toys so we can play, and she just seems so much more confident and happy. I used to worry about my cat's health and longevity, but not anymore - she's acting like her 5yo self again. She means the world to me, and I'm thrilled to have her back. Highly recommend!

Rated 5 out of 5 stars
By tinypanthertails on Oct 15, 2022

Hallelujah! Purrfect poop!

One of my boys, Finnegan, had an issue with chicken as a kitten. I fed fish-based food for a couple years when he started reacting to that as well and I wasn't able to get him back to baseline 💩. After testing, we discovered Finn has IBD and food sensitivities and my vet recommended a trial of hydrolyzed food. After a few months on Ultamino, his poop is purrfect (that was actually a quick change), he's gained weight and he's a much happier, sweeter cat. I do wish there was a canned version to aid in hydration, but I give him watered down pumpkin puree at mealtimes to help with that. I did try soaking the kibble in hot water - he wasn't thrilled. This food is pricey, but worth every penny to have my boy healthy and feeling great again!

Rated 5 out of 5 stars
By JosieB11 on Nov 7, 2022

Autoship is a hit or miss.

Great food & My cat aka Doodle has done very well on it. The problem is she's allergic to a lot of different ingredients so this food is a must. Since the pandemic it's hardly ever in stock. I have autoship so I never run out of her food but even with that they never have it. I had to shop around to find it somewhere else. Food is awesome but Chewy not so much on this product!!

Rated 5 out of 5 stars
By Marty on Dec 29, 2022

Royal Canin Ultamino

Our kitty was having digestive problems and our vet prescribed the Royal Canin Ultamino cat food. After a week of eating this food our kitty showed significant improvement in his health.

Rated 1 out of 5 stars
By GinPhil on Feb 1, 2023

cats do not like

Cats hated it. Not worth the money. Now I have a bag that I wasted money on.

Rated 2 out of 5 stars
By KATHRYN on Oct 29, 2022

Cat won't eat this

Unfortunately my cat won't eat this product. I was hopeful about it but he wouldn't even touch it.