Hill's Prescription Diet z/d Original Skin/Food Sensitivities Dry Cat Food

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8.5-lb bag
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Food sensitivity and intolerance are potentially serious problems that can result in sensitive or irritated skin, coat and ear conditions or even gastrointestinal upset. Cats that have a food sensitivity or intolerance, also called adverse reactions to food, typically experience an abnormal response to the protein in the food. If your cat suffers from adverse reactions to food, it is even more important to feed the right food. At Hill's, nutritionists and veterinarians have developed clinical nutrition especially formulated to help manage your cat's dietary sensitivity and help reduce the possibility of adverse reactions to food.

Key Benefits

  • Clinical nutrition especially formulated to help manage your cat's dietary sensitivity and help reduce the possibility of adverse reactions to food
  • Designed to improve digestion and stool quality with ingredients to help reduce gastrointestinal workload
  • Helps eliminate food related causes of skin irritation and a healthy skin barrier
  • Formulated with highly digestible proteins that minimize the chances of adverse reactions to food
  • Clinically proven antioxidants help maintain a healthy immune system and skin barrier function

Please note: Hill's is going through a packaging change: Original was formerly Ultra; same great formula, just a new name!

Special Note

Hill's Prescription Diets require a veterinary prescription. This product will not be shipped until a copy of a valid prescription authorization is faxed to 1-800-619-7973 or e-mailed to rx@chewy.com.

See all items by Hill's Prescription Diet

  • Item Number
  • Weight
    8.5 pounds
  • Food Texture
  • Brand
    Hill's, Science Diet
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Sensitive Digestion, Prescription Food

Nutritional Info


  1. Brewers Rice, Hydrolyzed Chicken Liver, Soybean Oil, Powdered Cellulose, Chicken Liver Flavor, Lactic Acid, Calcium Carbonate, Calcium Sulfate, Glyceryl Monostearate, Potassium Chloride, DL-Methionine, Choline Chloride, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin Supplement, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Vitamin D3 Supplement), Taurine, Iodized Salt, Dicalcium Phosphate, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene.

Caloric Content

  1. 398 kcal/cup
Guaranteed Analysis
Crude Protein 28.0% min
Crude Fat 12.0% min
Crude Fiber 3.5% max
Omega 3 Fatty Acids 0.3% min
Omega 6 Fatty Acids 3.0% min

Feeding Instructions

Adjust feeding amounts as necessary to maintain optimal weight. If you are unsure, ask your veterinarian. For best results & safety practices: Gradually transition to your pets new food over a 7 day period. Exclusively feed the recommended Prescription Diet dry food, canned food & treats. Keep fresh water available at all times. Have your veterinarian monitor your pets condition.

Transition Instructions

A gradual transition to a new pet food is important to avoid digestive upset. To transition, mix your pet’s current food with the new food. Over 7 days, gradually decrease the amount of the current pet food while increasing the amount of new pet food. In some cases, your veterinarian may recommend no transition or a shorter transition time.

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Customer Reviews

Hill's Prescription Diet z/d Original Skin/Food Sensitivities Dry Cat Food is rated 4.5 out of 5 by 106.
Rated 5 out of 5 by from Finally!!! The scratching has stopped! I have a Maine Coon cat who has been having issues with allergies since I adopted her a year and a half ago. She was scratching constantly and I spent months taking her back and forth to the vet. Despite all of our best efforts, and trying every food on the market, we could not get to the root of what was making her scratch. After months of anti-biotics to treat the sore areas and injections to stop the scratching, we were still nowhere in terms of alleviating her symptoms without drugs or figuring out what was causing them. Finally, I put her on z/d formula and within about three days the scratching began to decrease significantly. Now, a couple of weeks later, she has stopped scratching almost completely, maybe a scratch now and then, and is a much happier cat...No meds, no shots, no stressful visits back and forth to the vet. I still do not know the root of the problem, but it appears I have found a pretty awesome way to manage her symptoms and give her a much better quality of life.
Date published: 2016-11-28
Rated 5 out of 5 by from My Cats LOVE IT! When our vet recommended Hill's Food Sensitivities cat food, I was concerned that our <very picky> fur babies would not accept their new food. Totally unfounded concern. My kitties LOVE this food. During the integration process (combining their prior food with the new food to allow them to adjust), they ATE AROUND their old food to get to the new delicious Hill's Sensitivities diet food. YAY!!
Date published: 2016-12-01
Rated 5 out of 5 by from My other cat loves it I bought this kibble because the veterinarian at U.C. Davis prescribed it for my older cat, who was diagnosed with irritable bowel syndrome. It helped him regain weight and muscle mass. He was underweight with muscle wasting. My other cat likes it, too. I can sprinkle his medicine on it. It is not as dry as non-Rx kibble and his powdered meds stick to it. Much easier!
Date published: 2016-11-25
Rated 5 out of 5 by from Hill's prescription ZD diet My 12 years old cat was diagnosed with Inflammable Bowel Disease, who threw up 3-4 times a day, our vet prescribed this food for her, and she has not thrown up for almost a month. Keep our fingers crossed. I think this food really works.
Date published: 2017-02-06
Rated 5 out of 5 by from Both cats love it, & cat w/ with intestinal prob's is better I have two VERY finicky Burmese cats, one of whom has thickened intestinal walls indicating inflammatory bowel disease, which is very serious. It caused him to get increasingly sick, with diarrhea, frequent vomiting, weight loss, and his unhappiness indicated discomfort, too. The most common treatment for the condition is to feed the cat a prescription food such as this which has proteins that are already broken down into smaller bits that don't cause allergic reactions - and that's what Hill's z/d food is. Much to my surprise, my sick cat accepted this food very readily (likes it even better than his old kibble), and my second cat refused her old food in favor of this, so now it's the only food they eat. Too bad it's expensive compared to regular kibble, but it's still cheaper than the vet bills, and the sick cat is so much better! Both cats are at perfect weights, have shiny sleek coats and seem healthy & happy on this food, so I'm a big fan!
Date published: 2016-08-18
Rated 5 out of 5 by from Great product After my cat, Penny turned 2, he began scratching himself to the point where he would bleed and lose his hair. His belly was always red, and he was just miserable. After visiting many vets, I finally found one that recommended a prescription diet for him. After using this product and ONLY this product for about two weeks, his skin started to clear up and the scratching stopped. However, if your cat gets in to any other kind of food or treats (like mine tries to) the product does not work as effectively. Luckily, he is not a picky eater, so he enjoys the taste of the food too. I do have another cat who is a VERY picky eater (but no allergies), and he refuses to eat this food. If you have multiple cats and only one with an allergy, I would not recommend trying to put them all on this food. It is very expensive, so it's hard to keep up with. However, the product is definitely worth it if your kitty has a food allergy.
Date published: 2016-02-29
Rated 2 out of 5 by from Disappointed My cat was recently diagnosed with IBD. Her vet recommended that we slowly incorporate this food into her diet. Tonight, I mixed about half of the bag in with her Blue Buffalo dry food. To say she despises the new food is an understatement. She's picking around it and giving very apparent looks of disapproval. Our other cat isn't picky at all and is also refusing to eat it. I was hopeful that she wouldn't mind the new food after reading such positive reviews. Unfortunately, we now have a $55 bag of food going to waste and I have to try to find another brand to accommodate her condition.
Date published: 2017-01-04
Rated 5 out of 5 by from Our cat hasn't been sick since she started this food We had sort of resigned to the fact that our cat must just be getting older and having new symptoms that we would have to just accept. She had been throwing up more and more, losing weight, and acting sickly for over a year. Our vet recently recommended trying this food.....hydrolyzed protein for our sensitive cat. (Knock wood) She hasn't been sick again since she started eating this food....not once. It's only been 10 days, but this is a huge change. We're hopeful she will have lasting comfort from this specially formulated food.E
Date published: 2016-12-06
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