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Hill's Science Diet Science Diet
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Hill's Prescription Diet Prescription Diet
Hill's Healthy Advantage

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Adult 1+ Adult 1+
<br>Adult 7+

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<br>Adult 7+

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  • Prescription Diet z/d Canine ULTRA Allergen-Free - Dry Dog Food
z/d® Canine - Dry

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Hill's® Prescription Diet®
z/d® Canine

Skin/Food Sensitivities

Food sensitivities and intolerance are potentially serious problems that can result in sensitive or irritated skin, coat and ear conditions or even gastrointestinal upset. Dogs that have a food sensitivities or intolerance, also called adverse reactions to food, typically experience an abnormal response to the protein in the food. If your dog suffers from adverse reaction to food, it is even more important to feed the right food.

Hill's nutritionists & veterinarians developed Prescription Diet® z/d® clinical nutrition especially formulated to support your dog's skin and food sensitivities. In fact, z/d is clinically proven nutrition to help avoid adverse reactions to food.

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100% Guarantee We're confident your pet will enjoy Hill's® Prescription Diet® foods. We're so confident that we offer a 100% money-back guarantee.*

Prescription Diet Foods are made in our own U.S. facilities with ingredients from North America, Europe, and New Zealand, which exceed industry standards for purity and nutrient content.

* 100% Satisfaction Guarantee - if you are unsatisfied for any reason, return the unused portion to the place of purchase for a full refund or replacement.

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Key Benefits

How It Helps

  • Helps improve digestion & stool quality
  • Helps eliminate food related causes of skin irritation
  • Visible improvement in skin & coat
  • Helps maintain a healthy skin barrier

How It Works

  • Highly hydrolyzed protein
  • Single carbohydrate source: Corn Starch
  • Essential fatty acid enriched
  • Clinically proven antioxidants

Additional Info

Hill's® Prescription Diet® z/d® Canine is a complete and balanced food that provides all the nutrition dogs need. Please consult your veterinarian for further information on how our Prescription Diet® foods can help your dog to continue to enjoy a happy and active life.

Feeding Guide

Daily Feeding Guide:

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 pet's new food over a 7 day period.
  • Exclusively feed the recommended Prescription Diet dry food, wet food & treats.
  • Keep fresh water available at all times.
  • Have your veterinarian monitor your pet's condition.
  • To prevent suffocation, keep the packaging out of the reach of pets and children.

Feeding transition

Adult maintenance

Weight of DogAmount per Day
5 lb (2,3 kg) 2/3 cup (60 g)
10 lb (4,5 kg)1 1/8 cups (100 g)
15 lb (6,8 kg)1 1/2 cups (130 g)
20 lb (9,1 kg)1 3/4 cups (155 g)
30 lb (14 kg)2 1/2 cups (220 g)
40 lb (18 kg)3 cups (265 g)
50 lb (23 kg)3 2/3 cups (325 g)
60 lb (27 kg)4 1/4 cups (375 g)
70 lb (32 kg)4 3/4 cups (420 g)
80 lb (36 kg)5 1/4 cups (460 g)
100 lb (45 kg)6 1/4 cups (550 g)
Use only as directed by your veterinarian.
Animal feeding tests using AAFCO procedures substantiate that Prescription Diet® z/d® Canine provides complete and balanced nutrition for maintenance of adult dogs.

Average Nutrient and Caloric Content

Dry 3605 kcal/kg (317 kcal/cup)

Dry Matter1
Carbohydrate (NFE)58.4
Crude Fiber2.9
Vitamin C111 mg/kg
Vitamin E610 IU/kg
Omega-3 Fatty Acids Total0.53
Omega-6 Fatty Acids Total4.40


1The nutrient in the product after moisture is removed. It is used to make direct comparisons of nutrient profiles of products with differing moisture contents.
An eight fluid oz. measuring cup of z/d® Canine contains 3.1 oz. by weight.


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

z/d® Canine - Dry zd 052742843902,052742867601,052742790107 7901,8676,8439

Rated 4.6 out of 5 by 233 reviewers.
Rated 5 out of 5 by Cordelia's Mom Wants Puppy Cody to Be Healthy My mixed Golden Retriever/German Shepherd has had digestive problems all along, and she is 2 this week. The vet recommended the regular Hills Science Diet for Sensitive Stomachs, which seemed to help for awhile, but Cody could never seem to get rid of her periodic bouts of diarrhea. After trying everything else, including blood tests (all negative) and deworming, the vet finally suggested Hills Z/D for Skin/Food. What a difference! Cody's been on it for several weeks now and her stools are perfectly normal. She loves the food. The only problem we ran into was that we weren't feeding her enough, in light of the fact that she is no longer getting chicken, rice or any regular-market treats. Check the feeding chart for the weight of your dog. (And yes, it is expensive, but totally worth it.) October 12, 2015
Rated 5 out of 5 by Price This is my dogs last resort for food. Between switching her to this food and changing her meds, it changed her life. We did this when she was 2, and now she is 8!!! Please do not change this food, or discontinue it! If you do, you will be killing her.. I just wish it cost a little bit less... I also have 6 cats. 2 that someone dumped in our area...and she was pregnant. 7 kittens later! Lost 3.. We started with Hills Science Diet kitten, and it took care of their tummy issues, and they are now eating Hills Science Diet Optimal care... same issue.. Price.. but great food! Thank you so much! September 4, 2015
Rated 4 out of 5 by This product has helped with my dogs food allergies. My dog has extremely bad allergies (food & inhalant). He went thru 2 different types of prescription diets before he was put on his current Hills Prescription food. The other 2 foods, my little guy kept throwing up. He hasn't had any illness from this food and this food has def. improved his allergies, skin and coat. Before starting this food, my dog would have outbreaks of hives and patches of itchy spots which would turn into open sores. His amount of outbreaks from food allergies has drastically decreased and looks a lot healthier. May 28, 2014
Rated 4 out of 5 by Wonderful for allergies This product has really helped my dog with his allergy problems. He did not like it at first but has taken to it. October 30, 2013
Rated 5 out of 5 by The best for GI sensitive dogs We tried several dog food brands at the specialty pet stores and it was an effort to even get our little cavapoo ( half cavalier king charles spaniel and half toy poodle) to eat. He would have multiple episodes of vomiting and diarrhea. Then our vet had us try the Hills Science ZD ultra hypoallergenic food. We use the can and the kibble. Now he shakes with excitement before each meal which he chows down in no time. What a difference! I can't imagine what we would have to do if we didn't have this ZD food as an option. I sometimes think about his siblings and wonder if they also have this problem. But we are very grateful to Hills Science for creating this food that has helped our dog thrive and is now happy and healthy. May 24, 2015
Rated 5 out of 5 by Top of the line! As a veterinary professional, I understand how crucial it is to feed your pet the appropriate diet. Seeing clients day in and day out who insist on feeding "organic, grain-free, raw, etc" diets drives me crazy because I see the damage it does to their beloved pets. This food is great for food allergy dogs (and no it is not the same as over the counter "allergy" diets because the machines are cleaned and sanitized for hours before production begins ensuring no cross contamination plus the protein is hydrolyzed). My "allergic to everything" mutt has always been itchy because she suffers from food and environmental allergies. Even D/D was making her itch, though not Z/D! It's phenomenal. I absolutely love, trust, and stand by Hill's 110% because their foods are developed by nutritionists with the appropriate credentials. September 6, 2014
Rated 5 out of 5 by Great product The first 2 1/2 years of Ryder's life was spent trying to find the cause for her intermittent diarrhea. I tried many brands and types of dog food--ones for allergies, sensitive stomach and limited ingredient types, but to no avail. After reading an article about "hydrolyzed" dog foods, I tried Hill's Z-D low allergen. Although other conditions were never totally ruled out, it was determined that Ryder had a problem not being able to digest whole protein--regardless of the type; i.e. fish, meat or poultry. She has been eating Z-D for 5 years now and is doing great. I have tried a couple of times to switch her to something else, thinking she would outgrow the problem, but not so. Ryder is happy and I am happy--thank you Hill's. June 29, 2013
Rated 5 out of 5 by Bad allergies Hi, nothing seemed to work for what we think are protein allergies in my Giant Schnauzer dog. The moment we started this dog food, 11 years ago he immediately improved. We've since tried other dog foods to see if he could tolerate and he could he's been eating this for a long time. Now that he's older...I also suppplement his diet with the canned/wet z/d ultra dog food and he loves it. Thank you so much for providing this option for my dog...quite honestly, it probably saved his life :) June 30, 2014
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