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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This prescription item requires vet approval. Details


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.

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  • 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


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

398 kcal/cup

Guaranteed Analysis
Crude Protein 28.0% min
Crude Fat 12.0% min
Crude Fiber 3.5% max
Omega 3 Fatty Acids 0.3.0% 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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About Hill's Prescription Diet Foods for Skin / Food Sensitivities

Improving Lives Together

Groundbreaking Nutrition for Sensitive Cats

Groundbreaking Nutrition for Sensitive Cats

Cats with skin and coat conditions or food sensitivities can benefit from Hill's Prescription Diet d/d and z/d foods. Prescription Diet d/d has limited ingredient nutrition and a single intact animal protein. The Prescription Diet z/d food features hydrolyzed protein and a single carbohydrate source to minimize the risk of allergic reactions. Many pet parents discover that simply eating the right food can help eliminate food-related causes of skin irritation and help avoid reactions to food.

Clinical Nutrition

With Hill's, it's not just high-quality ingredients that count. Their focus is on the proper balance of nutrients in every recipe. So Hill's has developed foods that are designed to help pets with specific health conditions, providing the right nutrients to support their health. Hill's alliance with veterinarians puts them in a unique position find a nutrition recommendation for your pet no matter what health issue your pet is facing.

Formulated by Veterinarians

Hill's Prescription Diet started with a veterinarian's belief that some health issues could be managed through nutrition. What began as a theory has now been proven through extensive research by a team of over 220 vets, PhD nutritionists and food scientists. The results can be seen in Hill's Prescription Diet therapeutic pet foods.

Meeting the Highest Standards

Providing a food that delivers exactly what it says it does is Hill's number one priority, in fact, they perform over five million safety and quality checks every year. They've established relationships with trusted suppliers and will only accept ingredients that meet stringent standards.

The Taste Factor

The Taste Factor

You might know that Hill's Prescription Diet is good for your pet, but she's only concerned with the taste. Even though they place a heavy emphasis on nutrition, Hill's hasn't forgotten about palatability. Savory ingredients are combined to produce foods with enticing aromas, textures, and shapes that your pet can't resist.

Find the Right Formula

Talk to your veterinarian about the right formula for your pet.

Prescription Diet z/d Skin/Food Sensitivities

Original Flavor

Key Nutrients

  • Highly hydrolyzed single animal protein
  • Single carbohydrate source
  • High levels of vitamin E
  • Natural fiber
  • Essential fatty acids
  • Controlled minerals
  • Clinically proven antioxidants

Health Benefits

  • Promotes healthy skin barrier
  • Helps support immune system
  • Formulated to help improve stool quality
  • Helps eliminate food-related causes of skin irritation
  • Formulated to help reduce the risk of struvite and oxalate stones
Hill's Prescription Diet z/d Foods

d/d Skin/Food Sensitivities

Duck & Green Pea, Venison & Green Pea

Key Nutrients

  • Single intact animal protein
  • No soy protein or gluten
  • High levels of omega-3 and 6
  • Clinically proven antioxidants

Health Benefits

  • Helps improve digestion and stool quality
  • Leads to visible improvement in skin and coat
  • Helps maintain a healthy skin barrier
  • Supports immune system
Hill's Prescription Diet d/d Foods

About Hill's Prescription Diet

Hill's mission is to help enrich and lengthen the special relationships between people and their pet. Their Prescription Diet product line delivers clinically proven nutrition that supports common pet health concerns, from digestive and urinary health to aging and weight management.

Shop Hill's Prescription Diet

About Hill's Prescription Diet

Customer Reviews

146 reviews 146 Reviews 4.5 out of 5 Stars

94% Recommend

94% of reviewersrecommend this product

4.5 / 5
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  • Great Service

    By on

    Our cat had been sick. We were trying different food to see what worked. Two days after I received a case of wet Royal Canin (which our cat didn't like at all) our vet said we had to switch to Hills Z/D. I just spent $60.00 on that case and called to return it. They credited me and told me to "donate it". So I did. I took it to a local no kill shelter. He loves the new food and so far so good. They have a new friend in me!

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  • ZD good alternative

    By on

    My cat has eaten hypoallergenic food for 8 years and there are only 3 that have hydrolyzed protein. He gets tired of the HA (Purina) and the HP (Royal Canin) is too big for his mouth/teeth. We switch to this every few years and he loves it. Very good smell and tiny pieces he can handle.

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  • Easy to Order, Fast Delivery

    By on

    After receiving vet approval, my order was shipped and at my doorstep in two days. I am so happy about the auto ship program as well. Excellent discounts, free shipping, great product, amazing customer service!

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  • Cat loves it!!

    By on

    Vet prescribed this food for my cat with allergies. It would've cost $69.00 + tax at the vet . Saved 15.00 ordering from Chewy. Got it the next day. Thank God the cat loves it, and it takes very little to satisfy him.

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  • Great for cats who have sensitive stomachs

    By on

    My cat was throwing up several times every week. I got tired of cleaning up throw up, and of course worrying about the health of my cat. After taking her to the vet, he suggested changing her diet. We tried another first, but she was still getting sick. So then he suggested we try this kind, and it's been great for her! She has been on this food for a few months now, with no problems. So glad chewy.com carries it, because recently our vet was out of stock. Now I can easily have it shipped to my house and receive it in two days. And amazing customer service!

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  • No pet store online or in person can top Chewy.com

    By on

    My cat recently had surgery for bladder crystals which was found to be calcium oxcilate. She also had severe diarrhea from some stomach sensitivity. She was recently shelter adopted, so her background is unknown. We went through several RX diets and this was the only one that she liked ! It treated her severe diarrhea and it says it will greatly reduce both kind of stones. It was also about $20.00 less expensive than pet store in person!!! Ordering the RX food was fast and easy through Chewy.com. I HIGHLY recommend for any and all animal needs.

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  • Super product

    By on

    My cat's stomach problems are soooo much better even after being on this food for a week. He's 13 yrs old and seems much happier since apparently his stomach doesn't bother him as much. I would recommend this product to anyone whose cat is having digestion problems.

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  • Very effective

    By on

    The doctor prescribed this food because my cats had skin allergies; it did work however they did not like the taste so I am mixing it with their regular food

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  • Excellent cat food

    By on

    This is excellent cat food. It has cleared up digestive issues in my cat and made a world of difference. I wish it wasn't prescription as that is a hassle each time.

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  • My cats love it! Too early to see if the bumbs come back

    By on

    I have 3 cats one very serious allergies. She gets bumps over her body and then lick herself bald. I hate that she has to get steroid shots every two months. Her sister has one bump now, so no shots yet. Hoping this food will help. I also have a cat with digestive problems. So, my vet said to try the z/d diet and not to let them eat anything else. So far all 3 cats like it. I mix with with the z/d dry food. Still to early to see if we can get by with less shots. Keeping my fingers crossed. Chewy makes it easy to order. They contacted my vet and got us the food very fast. In fact, I think it was next day.

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