Petco Text Logo
Petco Pet Logo

Hill's Prescription Diet z/d Hydrolyzed Chicken Flavor Dry Dog Food, 25 lbs.

Hill's Prescription Diet z/d Hydrolyzed Chicken Flavor Dry Dog Food, 25 lbs.


Icon rx food 1
Veterinary Diet Item
This item requires veterinarian authorization
Icon info 2

This product requires veterinarian authorization. We’ll collect your pet and vet information to authorize this item before shipping.

Loading...
Weight
8 LB
$52.24
17.6 LB
$96.89
25 LB
$125.39
Free Shipping $35+
Icon carat down

Description

Please note that the product information displayed is provided by manufacturers, suppliers and other third parties and is not independently verified by Petco.

Food sensitivities and intolerances can cause skin irritation, ear conditions, and digestive upset. Dogs with adverse food reactions, often due to food allergies or intolerances, benefit from a diet specifically designed to support food sensitivities. Hill's nutritionists and veterinarians developed Prescription Diet z/d, a clinical nutrition specially formulated to support dogs with food sensitivities. Clinically proven to help avoid adverse food reactions, z/d provides targeted nutrition for dogs with food allergies or intolerances. Made with Hill's breakthrough ActivBiome+ Digestion, a proprietary blend of prebiotic fibers, which is clinically shown to activate the gut microbiome to support digestive health and promote healthy stool. This nutrition is also clinically shown to firm loose stool in 3 days.

  • - Hill's Prescription Diet z/d Hydrolyzed Dry Dog Food is specially formulated by Hill's nutritionists and veterinarians to manage dogs' food sensitivities
  • - Nutrition clinically proven to help avoid skin and digestive signs of adverse food reactions
  • - Made with highly hydrolyzed proteins that are broken down to avoid detection by the immune system
  • - Rich in Omega-6 & 3 fatty acids to promote skin health and regeneration
  • - Continued feeding reduces risk of adverse food reactions & promotes healthy skin and digestion
  • - Formulated to support visible improvement in skin & coat in 30 days
  • - Clinically shown to firm loose stool in 3 days

Specifications

SKU2191040
LifestageAdult
Primary FlavorChicken
Primary BrandHill's Prescription Diet
Days to ShipShips Within 2-5 Business Days
Weight25 LB

Additional Features

Grain FreeNo
Personalized Item flagYes
Primary FlavorChicken
LifestageAdult

Pet Sizing

Breed SizesMost Sizes

Item Dimensions

Length15.748 IN
Height5.709 IN
Width23.363 IN

Ingredients

Corn Starch, Hydrolyzed Chicken Liver, Hydrolyzed Chicken, Ground Pecan Shells, Powdered Cellulose, Flaxseed, Dried Beet Pulp, Hydrolyzed Chicken Flavor, Soybean Oil, Dried Citrus Pulp, Dicalcium Phosphate, Lactic Acid, Coconut Oil, Fish Oil, Calcium Carbonate, Pressed Cranberries, Glyceryl Monostearate, DL-Methionine, Potassium Chloride, Iodized Salt, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Calcium Pantothenate, Vitamin A Supplement, Riboflavin Supplement, Biotin, Pyridoxine Hydrochloride, Vitamin B12 Supplement, Folic Acid, Vitamin D3 Supplement), L-Tryptophan, Choline Chloride, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Magnesium Oxide, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene.

Guaranteed Analysis

Nutrient GA Min, GA Max: Moisture 10.0 %, Protein 15.5 %, Fat 11.0 %, Crude Fiber 8.0 %, Ash 7.6 %, Total Omega-3 FA 0.5 %, Total Omega-6 FA 1.5 %.

100% SATISFACTION GUARANTEED! Hill's is so confident that your pet will enjoy their foods, that they offer a 100% money-back guarantee. If you are unsatisfied for any reason, return the unused portion to the place of purchase for a full refund or replacement.

Please see package for complete 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.

Veterinarian authorized products ship only after Petco receives an authorization from your vet. We will not need to reach out to your vet or you if the authorization includes refills. When all available refills are used or the authorization expires, we will reach out to your vet to obtain a new authorization. For new authorizations, we will attempt to reach your vet for a total of 5 days. If your vet does not respond within 5 days, we will then reach out to you for a total of 3 days. If no response is given, the order will then be canceled.

Default": "These amounts are a starting point only and should be adjusted to maintain proper weight.

Use code: SAVE20. 20% Off Everything in store & online*. Shop Now. *Ends 10/19/25. Minimum $40 purchase. Select exclusions apply.

Reviews

Rating Snapshot

Select a row below to filter reviews.

5 stars

257

4 stars

57

3 stars

28

2 stars

7

1 stars

58

Overall Rating

4.1
201 out of 407 (49%) reviewers recommend this product

Review this Product

Adding a review will require a valid email for verification

Most Helpful Favorable Review

Sadie’s health

Reppucci pet

6 years ago

This is great for dogs with allergies to certain foods. Her itching is less and ...

Show Full Review

11 PEOPLE FOUND THIS HELPFUL

Show Reviews:

5

and

4

Most Helpful Critical Review

Works

Jackie2717

7 years ago

Our dog has a food allergy that we can’t narrow down so our vet has recommended ...

Show Full Review

7 PEOPLE FOUND THIS HELPFUL

Show Reviews:

3

2

and

1

Customer Images

Filter Reviews

Rating
1 - 8 of 267 Reviews
Most Recent

140 Ratings-Only Reviews

Oakley’s Story: Hill’s Z/D ActiveBiome+ Success

Relieved Dog Dad

7 days ago
There are some comments here that have hated the formula change, but for our family it has made a world of difference. Please don’t change it back! Our dog, Oakley, is 7 years old and has struggled with food sensitivities for most of his life due to being allergic to practically everything. For six years, he’s been on Hill’s Z/D along with daily Tylosin to manage his digestive issues, but his stools were always soft and never truly solid. Recently, something amazing happened—his stools finally normalized. We had no idea what caused the change until we discovered the new ActiveBiome+ addition in his food. That was the difference! This has been a complete game-changer for Oakley and for us. It may sound small, but seeing him comfortable, healthy, and thriving has brought us so much relief and joy. We’re beyond grateful to Hill’s for the care and science behind this improvement. Thank you for helping Oakley live a happier, healthier life! – Oakley’s Family
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

Cutey

8 days ago
My dog is having diarrhea and its reddish in color. She is sick and hiding under a bed. You need to change this formula for the wet food
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

So disappointed

Linda C.

26 days ago
So disappointed in this new formula. My dog had been eating ZD for 10 years with great results. As many other reviewers state there was no notice of a formula change. When the new food arrived we had to coax our dog to eat it. He clearly did not like it. And it’s not because he’s a “creature of habit” as suggested. Bought a bag of Royal Canin Ultramino from my vet today. He loved it instantly. We’ll be transitioning to that immediately. It does not contain ground pecan shells. I have to believe Hills switched to that ingredient to save cost. I would have paid more to stay with the old formula, but now you’ve lost me as a customer.
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

Response from Hill's Pet Nutrition:
23 days ago
Hill's Pet Nutrition
Thank you for your review. We're disappointed to hear of your experience. To maintain our leadership in nutritional health care for companion animals, we periodically make changes to product formulas to incorporate additional health or product design benefits. Our #1 value is the health of your pet, which is why we base all of our recipes and formulas on veterinary and scientific research on pet nutrition. High-quality pet food starts with understanding a pet’s nutritional needs first, such as life stage, lifestyle and health conditions. The Hill's Prescription Diet z/d contains an addition of ActivBiome+ Multi-Benefit Bundle: Advanced blend of prebiotic fibers and antioxidants support digestion, bolster the immune system, and support organ health.

Dog loves and also helps her ibd

27 days ago
My morkie has been diagnosed with irritable bowel disease this year and this is the only food from the recommended list that she likes and that has helped her belly

Yes, I recommend this product.

Helpful?

Horrible Change in formula huge mistake

Angie68

1 month ago
I was given this new formula w/o warning or any kind of notice. I was almost out of food so transitioning was 3 days not 7. My dog turned 9 today & his poop is black, hes constipated, lethargic, crying & he loved the original canned & dry, so now hes not eating, is scratching again (dont know the allergen) his skin & coat were perfect for the 1st time in yrs ON ORIGINAL RECIPE. We as consumers WHO R MAKING YOU VERY WEALTHY have a right to know when formulas are changed so WE can make an informed choice. Our vet recommended he switch to Royal Canin. I dont want soy or food made in "other countries". I want a CHOICE in what WE feed OUR dog! Its NOT YOUR DOG! Why cant u make both recipes so we can feed what we like & what works best for OUR DOG! It's unfair to the consumer but more importantly its unfair to the innocent animal that depends on us for their nutrition. Do the right thing HILLS, give us the choice! Our dog, our choice!
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

New formulation is horrible

Lee69

1 month ago
The formula has changed and now includes Pecan shells which are toxic to dogs. How could you do this? I don't care what your "scientists " say, it is toxic in more than one way. Look it up.
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

Response from Hill's Pet Nutrition:
1 month ago
Consumer Affairs
Thank you for reaching out to us. We understand your concerns about ingredients when it comes to feeding your beloved pet. While feeding pecan meat is not advisable, pecan shells do not contain the same toxic compound as the meat. The shells are considered a safe and beneficial source of fiber and received an official AAFCO definition in 2011. In a pecan cracking plant the shells go through a thorough cleaning process. The pecan shells receive 180 degree hot water washings and subsequent drying after separation from the pecan meats.

Hills z/d formulation change and deception!

Leo

1 month ago
My dog has been on z/d formula for years. We received our autoship from Chewy and noticed the food was significantly darker. We are going on day four of our dog refusing to eat this food. I came here to see if the formula changed, and sure enough it appears it has. Looking at Hill's responses to reviewers with the same concerns, how can you recommend transitioning from the old to the new formula over a seven day period if you've given no notification on the packaging or elsewhere to the consumer that the formula has changed? This is deceptive at best and detrimental to our dogs at worst. You've lost a loyal customer.
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

Response from Hill's Pet Nutrition:
1 month ago
Consumer Affairs
Thank you for your review. We are disappointed to hear of your experience. To maintain our leadership in nutritional health care for companion animals, we periodically make changes to product formulas to incorporate additional health or product design benefits. Despite the favorable benefits gained through the reformulation, our pets are creatures of habit and may need a little help to get accustomed to the change in the food. As a manufacturer, we notify retailers and veterinary clinics whenever we make changes to our pet food formulas. However, we understand that sometimes not all pet parents are made aware of these changes, and we sincerely apologize for any inconvenience this may cause. Reaching every single person who feeds our products can be challenging, but we are committed to keeping you as informed as possible.

Disappointed in new formula

Cocoa

1 month ago
VERY disappointed Hills would change a food that worked for so many of our pets. My dog will tolerate it but no longer loves his Hills Z/D. hy change something that worked so well? So very disappointed.
Originally posted on Hill's Pet Nutrition

Originally posted on Hill's Pet Nutrition

Response from Hill's Pet Nutrition:
1 month ago
Consumer Affairs
Thank you for your review. We are disappointed to hear of your experience. To maintain our leadership in nutritional health care for companion animals, we periodically make changes to product formulas to incorporate additional health or product design benefits. Despite the favorable benefits gained through the reformulation, our pets are creatures of habit and may need a little help to get accustomed to the change in the food. We added an advanced blend of prebiotic fibers and antioxidants to the Prescription Diet z/d products to support digestion, bolster the immune system, and support organ health. When the formula is changed, we recommend a transition from the old to the new formula over a seven day period.
1 - 8 of 267 Reviews

Questions

1 - 9 of 9 Questions
Sort by: Newest Answers

How do I change my prescription dog food order from a 25lb bag to a 17.6lb bag?

  1. You can cancel your current autoship order and place a new order with the smaller bag size. 



Did they change the size of the 25lb bag? With the change of the picture, the bag seems to contain less food. I can fit it in the bin I have where I couldn't before and I also run out quicker. I have repeat delivery and have had to order much sooner. 

  1. It is possible. After our dog being on z/d for two years we had to change her diet as she got pancreatitis. Was it the z/d? Wasn't anything else since that was all she ate.



Has anybody noticed the color of the poop that sacked for a few days if it turns dark brown almost black concerned puppy owner with allergies!!!

  1. No, That has not happened with us and we have 2 dogs age 6 and 8 years old on this dog food.



Did anyone’s dog get worse before getting better? 

  1. My girlie (Ozzie) maintained a status quo, no better and no worse on the z/d. Her allergy symptoms manifest as scratching especially her ears repeated frequent ear infections, She chewed on her front paws.  I answered your question so you can get some idea of how many had decreased symptoms or more/increased symptoms.  She has changed to a different brand of food and is seeing a skin and allergy specialist.  She is showing the first signs of improvement I’ve seen.



Does this food have the S/O+ Shield component?

    Is this dog food grain free?

    1. Sorry! I originally said yes, but I believe I was incorrect.



    I have a 4 months French bulldog and I wanted to know if it’s for puppies too

    1. I'm sorry, I do not know if it is for puppies too. I would ask your vet how they feel about feeding a 4 month old dog the Hills Z/D. My very allergic bubs started eating this brand when he was around a year old. It took a while because I tried different brands and even raw before I tried Hills Z/D. Raw worked well with eliminating his constant itch and red muzzle, but he always had soft stool. Long story short, it seems like my dog is allergic to seafood - and most dog foods have omega-3 from fish oil. In the end, Hills Z/D is amazing for my dog! I believe the soft food version has had recall issues. But the dry dog food hasn't. I hope this is helpful.



    My shelters have been eating this food for years.  However, we just bought a new bag and since we started feeding it to my dogs they have been acting differently.  They leave half of the food in their bowls and don’t seem interested in eating it.  

    1. This happened with my dog, Geo - when I first opened a 25 lb bag! He was hesitant to eat it, and his bowel movements (timing and texture) changed. After a few days (to ensure it was the food), I ordered another bag (17 lb bag so as to not have to throw away a 25 lb bag), and he is back to normal!



    I am doing a food trial using this dog food to rule out food allergies. I noticed there is chicken liver in the food. How is that going to rule out chicken as an allergy? It is the same as chicken in other dog foods correct? 

    1. according to my vet, it is hydrolyzed chicken which means all of the allergens have been taken out



    Styled arrow button