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

Hill's Prescription Diet z/d Food Sensitivities Dry Dog Food
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Images are for illustration purposes only. Packaging may change from time to time and images on our website may or may not be updated.

  • 3kg £32.99
  • 10kg £62.99

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Food sensitivities and intolerance are potentially serious problems that can result in irritated skin, coat and ear conditions or even gastrointestinal upset. Dogs that have adverse food reactions due to a food intolerance (typically to a protein in the food) or intolerance benefit from a food designed for food sensitivities.

Hill's nutritionists and veterinarians developed Prescription Diet z/d clinical nutrition especially formulated to support your dog's food sensitivities. In fact, z/d is clinically proven nutrition to reduce skin & digestive signs from food intolerances. Food sensitivities happen because proteins enter the skin and cross the digestive system to the body causing immune system to react.

z/d is a specialized food with proteins that are gentle and broken into smaller pieces to help avoid detection by the immune system to help your dog feed better, prebiotics to create a healthy gut microbiome balance and fatty acids to build healthy skin.

z/d is nutrition clinically proven to reduce skin & digestive signs from food intolerances which are the outward signs you see. Rest assured this product is working inside the pet to avoid the core issue which is due to an overactive immune reaction to certain foods. With pre-digested animal proteins, antioxidants, prebiotic fiber and skin nourishing nutrients.

Key Benefits:

  • Avoid adverse reactions with a single hydrolysed source of protein ActivBiome+ Technology for healthy stool.
  • Nutrition clinically proven to reduce skin & digestive signs from food intolerances.
  • Hydrolysed animal protein to help minimise signs of adverse food reactions.
  • Proven blend of prebiotic fibres that helps provide excellent stool quality.
  • Increased levels of essential fatty acids & high levels of vitamin E help promote a healthy skin barrier.
  • Clinically proven antioxidants help support a healthy immune system.

Recommended For:

  • Adverse food reactions (AFR) & elimination diet.
  • Otitis externa (chronic).
  • Protein losing enteropathy (PLE) without lymphangiectasia. Other Indications: Pruritic dermatitis.
  • Exocrine pancreatic insufficiency (EPI).
  • Flatulence.
  • Forms of chronic enteropathy (inflammatory bowel disease): Food responsive. Antibiotic responsive. Steroid responsive.

Not Recommended For:

  • Growing puppies, pregnant or nursing dogs.


  • Derivatives of vegetable origin, meat and animal derivatives, oils and fats (fish oil 0.9%), fruit, minerals, seeds. Carbohydrate source: Maize starch. Protein source: Chicken liver hydrolysate (26%).


  • Protein 17.6%, Fat content 14.4%, Crude fibre 6.5%, Essential fatty acids 4.2%, Crude ash 5.5%, Calcium 0.85%, Phosphorus 0.51%, Sodium 0.24%, Potassium 0.69%, Magnesium 0.07%; per kg: Vitamin A 11,421IU, Vitamin D3 786IU, Vitamin E 826mg, Vitamin C 115mg, Beta-carotene 1.4mg.

Exclusively feed the recommended Prescription Diet food. Before use ask your veterinarian for specific feeding instructions for your pet.

Fresh water should be available at all times.

New to this food? Mix increasing amounts of your pet's new food with decreasing amounts of the old food for 7 days or more. Your pet's nutritional needs may change as they age. Ask your vet at every checkup.

Store in a cool dry place and use before "Best Before" date.

Need help or advice? Contact us:

All prices include VAT where applicable.

Reviews (195)

Summary of Reviews for Hill's Prescription Diet z/d Food Sensitivities Dry Dog Food

Overall 5
Value For Money
Pet's Opinion
Nutritional Value
190 out of 195 (97%) customers would recommend this product.
5 stars (143 reviews)
4 stars (46 reviews)
3 stars (2 reviews)
2 stars (1 reviews)
1 stars (3 reviews)

Only verified purchasers of this product can leave a review.

45 Has helped his tummy
Verified Purchase

By on 26 May 2022

I had consulted a nutritionist, I had done an exclusion diet, but my dog was still in pain with his stomach and still had diarrhea and tenesmus. I have tried this and he's been on it for 3 weeks. It immediately helped ease the pain in the first few days, though he did still struggle a bit. Now he's doing consistently good poo without straining, so I am pleased I have finally found something that has helped the poor lad.

Customer recommends this product

45 Only food my dog eats consistently
Verified Purchase

By on 19 April 2022

Tried many brands, but this is the only food my dog eats consistently and the only food that doesn't sit off his allergies.

Customer recommends this product

45 Excellent product
Verified Purchase

By on 8 March 2022

My dog has a very sensitive stomach. This product keeps her really well the vast majority of the time. She loves the taste.

Customer recommends this product

55 Excellent Product for my Dog
Verified Purchase

By on 21 February 2022

The only food that suits my dog who has colitis

Customer recommends this product

55 z/d
Verified Purchase

By on 16 February 2022

good product for our dog

Customer recommends this product

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Q & A

Below are some recent questions we've received regarding Hill's Prescription Diet z/d Food Sensitivities Dry Dog Food, including answers from our team.

23 June 2022 at 10:15pm

Help why can't I find my usual food


  • VioVet customer since 2021
  • From: , United Kingdom

Hello, I've been feeding my 20kg dog hills prescription diet z/d dry food for the past year and my dog is doing great on it. I always buy the 10kg bag with the collie picture. I can't seem to find the same product anymore, can you please tell me the closest product to this please as I'm running low and may need to start introducing normal dog food soon. Thanks

  • VioVet Staff

Hills have updated their product packaging and so the collie pictured bag design is no longer available. However this is still the same Z/D food you are used to, you can continue using this Z/D without any issues.

12 November 2021 at 6:59pm

IBD pancreatitis and food intolerances


I have a 20kg staffy who is currently on hills z/d recommended by her vet but unfortunately I can not purchase it anywhere at the moment. What do you suggest as an alternative for her. She had pancreatic problems as a puppy that led to her having IBD. She is also very sensitive to certain foods but we are unsure of exactly what.

  • VioVet Staff

Purina HA and Royal Canin Anallergenic are the best alternatives to this brand. They are not necessarily the best diets for controlling pancreatic problems though. They are also veterinary diets so I recommend you run any use of these diets past your vet to be safe.

6 October 2021 at 1:14pm

Introduce gradually?

Suzanne White

the vet said we can feed this to our GSD straight away, no need for gradual introduction, but its going straight through her after one day

  • VioVet Staff

This diet cannot cause an allergic reaction as it is hydrolysed and anallergenic. If your dog has diarrhoea after changing to it then it is likely just the transition itself than anything else. Proteins vary between diets and different proteins require different enzymes to break down, it may be your dog needs to get used to the new food before being able to break these down. I advise transitioning slowly, give 10% of the new food and 90% of the old initially. Gradually build this so that after 5 to 7 days you are giving 100% of the new food.
If the signs persist then it may be unrelated to the food, you should see your vet if you see any deterioration or if signs are ongoing.

18 May 2021 at 9:52pm

Difference between products


Hi, I wondered if you could tell me the difference between hills z/d and d/d formulas please? I’ve a wee Tibetan Terrier who has been on z/d for approx 3 weeks (vets advise) and I think we are seeing a difference, so its potentially looking like her allergy is food related - itchy head/face/neck and recurring ear infection/yeast - both related to whatever the allergen is. Also with this in mind, I wondered if there was anything suitable we can give a as treats? Many thanks, Lorna

  • VioVet Staff

Hills Z/D is an anallergnic diet as it contains hydrolysed protein sources. These are specially formulated so that the body cannot react to them, no matter what the original ingredients are.
Hills D/D is a hypoallergenic novel protien diet. It contains venison with a single carbohydrate source. If your dog is allergic to venison or any of the ingredients then this can cause a reaction.

Both are veterinary diets so I advise discussing their use with the vet that is treating your pet. If you are looking for a hypoallergenic treat then Hill's Hypoallergenic Treats are a good choice.

15 April 2021 at 8:02am

Long list of allergies

Teri Wise

Hello, my dog Luna is a Tibetan Mastiff and has a very long list of allergies, these were discovered by blood tests conducted after a long period of ear infections and itchy paws/skin. I have listed the allergies below:

White Potato

Would this food be suitable to feed Luna?
Thank you

(I have listed all of her food allergies to aid your answer but also to hopefully help other dog owners who's pets suffer from one or all of the above to help them)

For other owners also, Luna is also allergic to trees, weeds, grass, moulds and mites! We use a prescription of Apoquel to aid her with this which is a very fast acting and helpful drug.

  • VioVet Staff

Hills Z/D is a hydrolysed protein diet. This means no matter what the original protein source in it is, it cannot cause a reaction in your dog. The proteins are specially processed so the body does not react to them.
It is a great choice for your allergic dog as you can guarantee it will not set off Luna's allergy. It must be fed as the only diet for this though (no treats/scavenging). It is also a veterinary diet so any use of it should be run past your vet first.

I recommend reading our blog 'Allergies in cats and dogs - a vet guide' for a good summary on allergies and how to use foods like this.

12 December 2020 at 7:07pm

Food quantity

Jennie Hill

I want to feed my 10kg cockatoo who suffers from pancreatitis the correct mix of your I/D food
What quantities do you suggest for the mix.

  • VioVet Staff

I assume you mean '10kg Cockapoo' not Cockatoo? I do not recommend using the Hills Z/D for your dog with pancreatitis as it is not a low fat diet and it is intended for use in dogs with food allergies/intolerances. I recommend using the Hills I/D Low Fat food for your dog with pancreatitis. This should ideally be fed as the only diet, feeding guidelines can be found on the packaging itself.

13 September 2019 at 7:05pm

Mini zd and the normal

Joanne George

  • VioVet customer since 2019
  • From: Tyne and Wear, United Kingdom

Are the kibbles exactly the same just the size? Which is better for a french bulldog and can it be mixed with the wet food? Or should you stick to one or the other?
Thank you

  • VioVet Staff


Thank you for your question,

The mini z/d is smaller kibble but the formulation is the same across the different sizes. I'd probably give a French Bulldog the mini version unless you know he likes larger kibble - personal preference really :-)

You can use the wet and dry together - the easiest option if your dog is fed twice a day would be to feed dry for one meal, and wet for another. Or you can mix but just take care whichever way you do it to reduce the total daily amount of each appropriately so that your dog received the correct amount of calories per day.

I hope this helps!

22 September 2015 at 2:07pm

Redness of skin

Lisa mayle

My dog has finished her steroids and anti biotic about a week ago. She has been on z/d for nearly three weeks. Her skin has started to go red again and has started to lick her paws again. Does this mean the allergy is not food related X

  • VioVet Staff

This is suspicious and it might rule out a food allergy, but it is too early to say. Some dogs do need more than 3 weeks to show a full response. Also some dogs will pinch a small amount of food (bread, biscuit etc) and if they happen to have a wheat allergy, or some other constituent of what they ate, they will react again. I would certainly suggest that you give the diet more time, but you are right and it might prove that this is not purely a dietary allergy. It is a bit too early to be sure about that.

2 May 2015 at 7:33am

Allergic to potatoes

bailey bobs

My dog is allergic to potatoes corn wheat and rice has severe skin. Allergies tothese myvet has put him on hills zd he loves it.but notice this has potatoes in.

  • VioVet Staff

All the proteins in Hills z/d have been treated to make sure that they are not recognised by the immune system. This means that even if potato is bad for your dog (which is unusual but certainly possible) it is OK to give him this particular food. [The proteins are "hydrolysed" which means they are broken down into smaller molecules. This does not affect their nutritional value, but makes them unable to cause an allergic response.]

25 January 2015 at 7:36pm

ZD 156g cans

C Berman

  • VioVet customer since 2012
  • From: London, United Kingdom

Please can you tell me if the 156g tins are permanently discontinued?

  • VioVet Staff

Yes, Hills have discontinued the 24 x 156g cans and replaced them with the 12 x 370g cans.

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