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.

See all items by Hill's Prescription Diet

  • 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.

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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

381 reviews 381 Reviews 4.7 out of 5 Stars

96% Recommend

96% of reviewersrecommend this product

4.7 / 5

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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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  • 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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  • 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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  • Finally something that worked

    By on

    My beautiful boxer was losing weight and it seemed everything was going right through her until the Vet suggested we try this. After the week of converting over to just this diet she has normal bowels, is putting back her weight and her coat is getting back to its beautiful condition, so shiny. I would recommend this to anyone who has a dog with digestion issues.

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  • Hills prescription diet

    By on

    My dog seemed to transitional well from her older food to this one in about 4-5 days she was only eating Hill's. She likes it and I am waiting to see if I can notice any differences about her digestive system and skins conditions to see if this will help her sensitivities. I figured I would give it about 6 weeks before I would see anything different.

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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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    By on

    This was my first experience with Chewy and it was a GREAT EXPERIENCE. Ordering online was so easy and the delivery was even faster than expected.....actually received the food in 2 days. RARELY can you make either of those statements but I can honestly make BOTH. Plus it's a huge time-saver. My vet asks that I call to order the food (Monday) and then I have to drive to my vet 3-4 days later to pick it up. LOVE CHEWY!!

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  • Back to normal

    By on

    My dog Rambo was prescribed this. He really loves the food, we also got him z/d dog treats which he loves also. And of course the most important thing is that he know longer vomits anymore

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  • Happy Customer

    By on

    Chewys provided this replacement when the first arrived with problems. The people providing customer support were exceptional, very expeditious, and courteous to a fault. It is support like this for customers that will keep us continuing to order in the future. Thank you.

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  • Thank heavens for this food!

    By on

    My beagle Otto suffers from food allergies, seasonal, and is actually allergic to himself. This has helped tremendously! None of the grain free etc options were working for him and neither were any of the oral or injection medications. This has improved him so much!

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