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

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25-lb bag
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This prescription item requires vet approval. Details


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 and 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.

Key Benefits

  • Helps improve digestion and stool quality with highly hydrolyzed protein
  • Helps eliminate food related causes of skin irritation and results in visible improvement to the skin and coat
  • Helps maintain a healthy skin barrier and enriched with essential fatty acid
  • Developed with a single carbohydrate source: Corn Starch
  • Clinically proven antioxidants are added for optimal health benefits

This product requires a veterinary prescription. Simply provide your vet's information during checkout and we'll follow up to confirm the prescription, or email a copy of your prescription to rx@chewy.com and we'll get your order out right away.

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  • Item Number
  • Weight
    25.0 pounds
  • Brand
    Hill's, Science Diet
  • Breed Size
    Small Breeds, Medium Breeds, Large Breeds, All Breeds
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Prescription Food

Nutritional Info


Corn Starch, Hydrolyzed Chicken Liver, Powdered Cellulose, Soybean Oil, Calcium Carbonate, Dicalcium Phosphate, Lactic Acid, Potassium Chloride, Glyceryl Monostearate, Choline Chloride, Iodized Salt, 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), DL-Methionine, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Taurine, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene.

Caloric Content

354 kcal/cup

Guaranteed Analysis
Crude Protein 14.0% min
Crude Fat 10.0% min
Crude Fiber 5.0% 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: Use only as directed by your veterinarian. 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.

About Hill's Prescription Diet Foods for Skin / Food Sensitivities

Improving Lives Together

Groundbreaking Nutrition for Sensitive Dogs

Groundbreaking Nutrition for Sensitive Dogs

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

z/d Skin/Food Sensitivities

z/d Skin/Food Sensitivities


Key Nutrients

  • Highly hydrolyzed animal protein
  • Single purified carbohydrate source
  • High levels of vitamin E
  • Natural fiber
  • Essential fatty acid enriched
  • Clinically proven antioxidants

Health Benefits

  • Visible skin and coat improvement in 30 days
  • Promotes healthy skin barrier
  • Helps support a healthy immune system
  • Clinically proven to help normalize stool
d/d Skin/Food Sensitivities

d/d Skin/Food Sensitivities

Potato & Venison

Potato & Duck

Potato & Salmon

Key Nutrients

  • Limited ingredient nutrition with single intact animal protein
  • No soy protein or gluten
  • High levels of omega-3 and 6
  • Clinically proven antioxidants

Health Benefits

  • Results you can see in the skin and coat
  • Helps maintain a healthy skin barrier
  • Helps improve digestion and stool quality
  • Supports a healthy immune system
Derm Defense

Derm Defense


Key Nutrients

  • With proprietary complex of bioactives and phytonutrients
  • High levels of omega-3 and 6 fatty acids
  • Clinically proven antioxidants, including vitamin E
  • No corn, chicken or by-product meal, artificial colors, flavors or preservatives

Health Benefits

  • Helps strengthen skin barrier
  • Drives healthy skin from within
  • Formulated to help soothe and nourish skin and coat
  • Helps skin to recover naturally
  • Holistic long-term solution supporting healthy immune system

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

390 reviews 390 Reviews 4.7 out of 5 Stars

96% Recommend

96% of reviewersrecommend this product

4.7 / 5

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  • My American Bulldog hated this food-but it worked

    By on

    I have a large American Bulldog (115 lbs) that was prescribed this food by our Vet to deal with digestive issues and skin allergies for about 2 months. The kibble size was so small that he kept getting the food stuck in his throat and coughing. Not to mention that he hated the taste and this dog eats just about anything! It did take care of his digestive issues and he lost some weight but the skin allergies persisted. Finally found out it was a fungal infection and used an OTC cream to treat. He's now on Natural Balance Ultra Large breed limited ingredient and is doing fine.

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  • My dogs LOVE this food!!

    By on

    It took several years to finally find a food that my dogs LOVE and will eat by itself! I've been having to "doctor up" their food w/so many different add-ins but NOT w/this food. I'm THRILLED - possibly more than they are!! And my "picky eater" is now actually gaining some weight. Also.....big KUDOS to Chewy for shipping my auto ship early per my request - received it day after my request. Awesome!

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  • First order of new food

    By on

    Our 7 year old Labradore Retreiver has developed food allergies to grains, sugars. Reactions are yeast buildup on his skin, red eyes, and ear infections. This Hills Z/D is prescription ordered. As per directions from our veterinarian, it is being introduced gradually over this first 4 weeks, blended with his current diet. So far so good to know if will improve his skin and ears.

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  • Perfect for my dog

    By on

    Over the past 8 months my dog has had reoccurring shin rashes and digestion issues. After my dog's Veterinarian ruled out all possibilities I was told to try Hill's Prescription Diet z/d. I am so happy we made the switch to this food. My dog has only been eating this food for over a month and all her issues are gone.

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  • Amazing!!!!

    By on

    I have a German Shepard that has very sensitive skin and stomach. After trying many very good brands of dog food, my vet suggested this one. After a week, my dog stopped itching and biting at her legs and stomach. Although it’s a little pricey, it saves me a bunch from vet bills a month!!!

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  • our Manchester puppy Jake

    By on

    Our puppy Jake was started on this food by his owner/handler and this food was recommended by him. He had been shown by him. When we purchased Jake from his owner, this is what he fed him from time he could eat and never had a problem. He is a Manchester Terrier and they can have problems with food at times--he never did.We kept Jake on this food , even if its pricy and were pleased with the results.

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  • Worked wonders for our dog

    By on

    First: Chewy is an excellent company that is a pleasure to order from. Fast, super friendly and accomodating. Second: This food was a miracle for our adopted springer, who seemed to have hopeless allergy issues that resulted in chronically infected anal glands, flaky skin, and thin hair. Six weeks later, he has never looked or smelled better than now. We are so grateful. It did take 6 weeks to kick in, though, so don't lose hope if you're just starting your dog on this food.

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  • Compliment

    By on

    This is my second order from Chewy and boy am I impressed. Quality product, super customer service staff and fantastic fast shipping. My dogs have trouble with other dog food but seem to like Hill's Prescription the best. Thank you Chewy from a very satisfied customer.

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  • Great service

    By on

    The food has been working pretty well. Vet recommended it because our dog has terrible allergies. Hasn’t completely fixed the problem but it’s a noticeable difference.

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  • Special Food

    By on

    Perfect. Thank you for the attention and that arrived on time. I really appreciate the attention and feedback of the company. I recommend always. Suzy

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