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Hills Prescription Diet z/d Cat Food

  • Dry » 2kg Bag £21.70
  • Ultra Allergen Free Wet » 24 x 156g Cans £32.96

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Hills Z/D available from VioVet

Dietary allergies and food intolerances are surprisingly common in cats. They usually develop in young or middle aged cats and can cause a variety of problems affecting the digestion as well as the skin. Usually they will be to one or more specific proteins in the diet. None of the dietary proteins which commonly cause these reactions are present in Hills Prescription z/d Diets, so feeding the diet for at lease 6 weeks will allow the reaction to subside and the symptoms improve.

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Feeding Guide


These ranges are a starting point only, because cats' needs vary.Adjust the feeding amount to maintain optimal body weight.

Body weight kg Dry grams
2 30 - 45
3 45 - 60
4 55 - 75
5 65 - 85
6 70 - 100
7 + 12 - 14 per kg

A 156g can of z/dTM ULTRA Allergen-Free Feline canned is equal to 45 grams of z/dTM Low Allergen Feline dry.


Body Weight kg Cans 156g
2 2/3 - 1
3 1 - 1 1/3
4 1 1/4 - 1 2/3
5 1 1/3 - 2
6 1 1/2 - 2 1/4
7 + 1/4 per kg

Kibble image

Hills Prescription Diet z/d key benefits

Protein Single animal source: chicken liver
Extensively hydrolysed.
Reduced amount
Helps minimise adverse food reactions.
Carbohydrate Single source: rice Adverse reaction to rice is rare in cats
Essential fatty acids Increased Helps nourish the skin and coat.
Digestibility High Improves nutrient availability for patients with compromised digestive tracts
Superior antioxydant formula Added Neutralizes free radicals.



Ground rice, rice protein concentrate, chicken liver hydrolysate, vegetable oil, dried chicken liver hydrolysate, calcium carbonate, cellulose, potassium chloride, dicalcium phosphate, salt, calcium sulphate, taurine, vitamins and trace elements. Contains EU approved antioxidant.


Chicken liver hydrolysate, maize starch, vegetable oil, cellulose, calcium carbonate, DL-methionine, dicalcium phosphate, potassium chloride, iodised salt, taurine, calcium sulphate, vitamins and trace elements.

Additional information

  • Proteins with a molecular weight less than 10,000 daltons are unlikely to be detected by the immune system.
  • The animal protein in z/dTM ULTRA Allergen-Free Feline is extensively hydrolysed (a major part of the protein has less than 3,000Daltons in size) to minimise the risk to be detected by the immune system.
  • The carbohydrate source is maize starch, refined to contain less than 0.3% vegetable protein.
  • The fat source is vegetable oil, purified to contain no protein.
  • z/dTM ULTRA Allergen-Free Feline only exists as canned food, if preferred, it can be fed together with z/dTM low Allergen Feline dry, if the cat does not have an adverse reaction against rice.

Recommended for

  • Adverse food reactions (food allergy or food intolerance)
  • Use as an elimination diet to rule out adverse food reactions in case of:
    • Chronic pruritus.
    • Otitis externa.
    • Gastro-intestinal disorders such as inflammatory bowel disease (including colitis).

Not recommended for

  • Kittens
  • Pregnant or lactating queens

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Reviews of Hills Prescription Diet z/d Cat Food

Read our customers' reviews of Hills Prescription Diet z/d Cat Food

Questions & Answers for Hills Prescription Diet z/d Cat Food

Below are some recent questions we've received regarding Hills Prescription Diet z/d Cat Food, including answers from our team.

Ask Your Own Question

The difference

17th Mar 2016
Annette McDonald
  • VioVet Customer Since: January 2016
  • From: County Antrim, United Kingdom

What is the difference between the zd and the sensitive hills food as I ordered the sensitive food instead of the zd that my cat is on as he had allergies and the vet isn't sure what of all I no is that fleas are one

John Cousins
  • Veterinary Surgeon

These two diets are completely different and are used in different situations. The z/d is processed so that it cannot contain any food allergens at all (theoretically). If there is a genuine concern about a dietary allergy, z/d is a good choice. The Sensitive diet is not free of allergens and might cause trouble if a cat happens to be allergic to one of the ingredients. The good thing about the Sensitive diet is that it is generally very easy to digest, so most cats will do well on it if they are prone to diarrhoea for other reasons. It would be fine to use in a cat with a flea allergy.