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Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food

Compare ingredients, guaranteed analysis, and AAFCO nutritional adequacy, side by side.

Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food and Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food compared

Nutrients:
As Fed
Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food
Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food
Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food
Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food

Verified Jul 20, 2026

KibbleLab score The KibbleLab expert rating, 0 to 10, based on published veterinary science.
Not listed Not listed
Guaranteed analysis (as fed)
Protein Guaranteed analysis gives label minimums and maximums, not measured values, shown as fed.
Not listed 24.00%
Fat Not listed 18.00%
Fiber 1.40% 5.40%
Calcium 0.75% Not listed
Phosphorus 0.59% 0.57%
Omega-3 0.94% Not listed
Omega-6 4.44% Not listed
Taurine 0.36% Not listed
Moisture Higher moisture means a wetter food; it dilutes the other percentages above.
Not listed 8.00%
Calories 3847 kcal/kg 3982 kcal/kg
Calorie density Moderate Moderate
Ingredients
Full ingredient list Every ingredient on each label, in order of weight.
Brewers Rice, Hydrolyzed Chicken Liver, Rice Protein Concentrate, Soybean Oil, Chicken Liver Flavor, Coconut Oil, Ground Pecan Shells, Calcium Carbonate, Lactic Acid, Potassium Chloride, Fish Oil, Glyceryl Monostearate, Flaxseed, Dried Beet Pulp, Dried Citrus Pulp, L-Lysine, Calcium Sulfate, L-Threonine, Dicalcium Phosphate, Choline Chloride, DL-Methionine, Pressed Cranberries, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin Supplement, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Vitamin D3 Supplement), Taurine, Cysteine, Iodized Salt, Potassium Citrate, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), L-Tryptophan, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene. Show full list
Brewers rice, hydrolized soy protein, chicken fat, dried chicory root, natural flavors, powdered cellulose, vegetable oil, fish oil, calcium carbonate, potassium chloride, fructooligosaccharides, sodium pyrophosphate, calcium sulfate, sodium silico aluminate, DL-methionine, choline chloride, taurine, vitamins [DL-alpha tocopherol acetate (source of vitamin E), niacin supplement, L-ascorbyl-2-polyphosphate (source of vitamin C), D-calcium pantothenate, biotin, pyridoxine hydrochloride (vitamin B6), riboflavin supplement, thiamine mononitrate (vitamin B1), vitamin A acetate, vitamin B12 supplement, folic acid], trace minerals [zinc proteinate, zinc oxide, manganese proteinate, manganous oxide, copper sulfate, ferrous sulfate, sodium selenite, copper proteinate, calcium iodate], GLA safflower oil, marigold extract (Tagetes erecta L.), rosemary extract, preserved with mixed tocopherols and citric acid. Show full list
Limited ingredient No No
Marketed benefits Digestive health, Itch relief, Allergy support Kidney care, Appetite support, Digestive health, Skin coat health
Format & suitability
Food type Dry Dry
Texture Kibble Kibble
Processing Not listed Not listed
Life stage Adult Adult
Breed size All Breed Sizes All Breed Sizes
AAFCO nutritional adequacy
Complete & balanced Whether the manufacturer's label claims the food meets AAFCO nutrient profiles for a life stage. Not an independent test.
Yes Not indicated
Life stages Adult Maintenance Not listed
Substantiation How adequacy was established. Feeding trials are the higher bar; formulation means the recipe is calculated to meet the profile.
Feeding Trials Not listed
Maker standards
WSAVA guidelines The World Small Animal Veterinary Association publishes criteria for evaluating a manufacturer: qualified nutritionists on staff, feeding trials, and published research. It does not certify or endorse brands.
Yes Yes
PSC accredited The Pet Sustainability Coalition is a nonprofit that accredits pet companies on their environmental and social impact through third-party verification. It reflects sustainability practices, not food quality.
Yes No
Recalls & where to buy
Recalls on record We track the FDA's animal food recall listings back to January 2019 and publish every pet food recall automatically. A filing that isn't pet food may not appear here.
None None
Where to buy
Shop Chewy Amazon
Shop Chewy Amazon

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Shared ingredients

Both foods list these among their top ingredients, by label weight.

  • Brewer's Rice
  • Calcium Carbonate
  • Potassium Chloride

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Common Questions

Do these two foods share ingredients?

Yes. They share these top ingredients: Brewer's Rice, Calcium Carbonate, Potassium Chloride.

Are both foods AAFCO complete and balanced?

Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food is labeled complete and balanced; Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food does not list an AAFCO status.

See the full profiles: Hill's Prescription Diet z/d Skin & Food Sensitivities Hydrolyzed Chicken Flavor Dry Cat Food and Royal Canin Feline Renal Support + Hydrolyzed Protein Dry Cat Food .

KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.

This is a neutral, factual comparison, not a ranking or an endorsement of either product. A food's guaranteed analysis gives legal minimums and maximums for a few nutrients, not measured values. No one can pay for placement or a higher score.

Product details are compiled from public sources and may not reflect the latest formulation. Represent one of these brands? Request a correction. Anyone else can email us.