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 4.2378 out of 5 stars
Veterinary Diet Item
$69.99Chewy Price
$66.49Autoship Price
(Save an extra 5%)

Why Autoship?

  • Save 5% on all future Autoship orders
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This item requires vet authorization.

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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 4.2378 out of 5 stars
185 Reviews
Would recommend to a friend

185 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
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.

Rated 4 out of 5 stars
By TuxedoCatMom on May 14, 2022

Food Allergies Solution

Our cat started having food allergies when she was about 9 years old, with frequent diarrhea that became alarming when there was blood in it. The vet ran all the tests and suggested that we try hydrolized protein diet as a food trial. What a relief to find Ultamino! Our cat was miffed that we didn’t give her any more Fancy Feast or Science Diet, but gradually accepted this kibble. Her poops are generally solid now, occasionally softer when life gets stressful, like the plumber visiting or a thunder storm. Ultamino is a great solution for our cat’s IBD — though I’m learning to order extra because it’s too often Out of Stock! That’s the only reason for 4 stars instead of 5. She also had dandruff, which cleared up nicely after a few months on this food.

Rated 5 out of 5 stars
By duckieht on May 11, 2022

The only thing that works for my cat with severe food allergies!

I've tried every other high-quality brand and even the Royal Canin Hydrolized Protein, and this food is the ONLY thing that works for my cat with severe food allergies. Her allergies mainly manifest with severe skin itching, to the point that she licks herself raw and has sore patches all over herself. Some diarrhea also. When this comes back in stock, I buy multiple bags so that she never runs out. It's expensive but definitely worth it!!!

Rated 5 out of 5 stars
By AndieJo on May 9, 2022

It's not hyperbole, folks!!!

This food is literally the only thing my "Patootie" can eat. And that's not hyperbolic... it's the truth, plain and simple. What's scary is, when this food is out of stock, Patootie's health goes into decline. I wish there wasn't such a dependency; but he suffered for years, with HORRIBLE "inflammatory bowel disease", before figuring out the cause of it. Once we found Ultamino, it was clear it was THE cure to his ailments. We even tried Royal Canin's "Hydrolyzed Protein" (which is a step below the Ultamino), as we have other kitties who respond well to that; however, Patootie showed only a tad of improvement on the HP. If you're lucky enough to grab this, whenever it's in stock, then good for you! I was finally able to do so, and I'm SUPER relieved! My little guy gets instant relief from the severe food-intolerance, by which he's plagued, that reeks havoc upon his lower-gastrointestinal system. It's AWFUL trying to remedy his symptoms, to no avail, when we know he just needs his Ultamino. I know there are plenty of other folks, who are going through this same frustration, worrying while knowing their feline friend is suffering. I hope all this insanity ends soon and the world gets its normalcy returned. I'm hoping for the best!