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Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food Purina Pro Plan Veterinary Diets HA Hydrolyzed Protein Chicken Formula Dry Dog Food

Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food scores higher on KibbleLab, 9.1 to 8.4. Compare ingredients, guaranteed analysis, and AAFCO nutritional adequacy, side by side.

Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food and Purina Pro Plan Veterinary Diets HA Hydrolyzed Protein Chicken Formula Dry Dog Food compared

Nutrients:
As Fed
Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food
Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food

Verified Jul 29, 2026

Purina Pro Plan Veterinary Diets HA Hydrolyzed Protein Chicken Formula Dry Dog Food
Purina Pro Plan Veterinary Diets HA Hydrolyzed Protein Chicken Formula Dry Dog Food

Verified Jul 21, 2026

KibbleLab score The KibbleLab expert rating, 0 to 10, based on published veterinary science. No one can pay for a higher score.
9.1 / 10 8.4 / 10
Guaranteed analysis (as fed)
Protein Guaranteed analysis gives label minimums and maximums, not measured values, shown as fed.
Not listed 18.00%
Fat Not listed 9.50%
Fiber 4.50% 4.00%
Calcium 0.80% 0.70%
Phosphorus 0.55% 0.60%
Omega-3 0.60% Not listed
Omega-6 2.07% Not listed
Moisture Higher moisture means a wetter food; it dilutes the other percentages above.
Not listed 11.00%
Calories 3198 kcal/kg 3563 kcal/kg
Calorie density Low Moderate
Ingredients
Full ingredient list Every ingredient on each label, in order of weight.
Corn Starch, Hydrolyzed Soy Protein, Powdered Cellulose, Dicalcium Phosphate, Soybean Oil, Hydrolyzed Chicken Flavor, Ground Pecan Shells, Coconut Oil, Lactic Acid, Potassium Chloride, Flaxseed, Glyceryl Monostearate, Dried Beet Pulp, Dried Citrus Pulp, DL-Methionine, Fish Oil, Choline Chloride, Calcium Sulfate, Pressed Cranberries, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Pyridoxine Hydrochloride, Calcium Pantothenate, Riboflavin Supplement, Vitamin A Supplement, Biotin, Vitamin B12 Supplement, Folic Acid, Vitamin D3 Supplement), Calcium Carbonate, Iodized Salt, Taurine, Magnesium Oxide, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), L-Tryptophan, Mixed Tocopherols for freshness, Natural Flavors, L-Carnitine, Beta-Carotene. Show full list
Corn starch, hydrolyzed soy protein isolate, partially hydrogenated canola oil preserved with TBHQ, coconut oil, powdered cellulose, tricalcium phosphate, corn oil, dicalcium phosphate, hydrolyzed chicken liver, hydrolyzed chicken giblets, potassium chloride, guar gum, choline chloride, calcium carbonate, salt, magnesium oxide, DL-Methionine, taurine, zinc sulfate, Vitamin E supplement, ferrous sulfate, manganese sulfate, soybean oil, niacin (Vitamin B-3), copper sulfate, Vitamin A supplement, calcium pantothenate (Vitamin B-5), thiamine mononitrate (Vitamin B-1), riboflavin supplement (Vitamin B-2), Vitamin B-12 supplement, garlic oil, pyridoxine hydrochloride (Vitamin B-6), calcium iodate, folic acid (Vitamin B-9), Vitamin D-3 supplement, biotin (Vitamin B-7), menadione sodium bisulfite complex (Vitamin K), sodium selenite. Show full list
Limited ingredient No No
Health focus Allergy support, Digestive health, Skin coat health, Urinary care, Immune support, Low fat Allergy support, Digestive health, Antioxidant support, Sensitive stomach
Format & suitability
Food type Dry Dry
Texture Kibble Kibble
Processing Not listed Hydrolyzed
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 Yes
Life stages Adult Maintenance Adult Maintenance
Substantiation How adequacy was established. Feeding trials are the higher bar; formulation means the recipe is calculated to meet the profile.
Feeding Trials Formulation
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 KibbleLab began logging recalls in July 2026, so earlier recalls may not appear.
None None
Where to buy
Amazon Chewy
Amazon

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Shared ingredients

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

  • Corn Starch
  • Cellulose Powder
  • Dicalcium Phosphate
  • Coconut Oil

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Common Questions

Which food scores higher on KibbleLab?

Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food scores higher, 9.1 to 8.4 out of 10. Scores reflect published veterinary science, and no one can pay for a higher score.

Do these two foods share ingredients?

Yes. They share these top ingredients: Corn Starch, Cellulose Powder, Dicalcium Phosphate, Coconut Oil.

Are both foods AAFCO complete and balanced?

Yes, both foods are labeled AAFCO complete and balanced.

See the full profiles: Hill's Prescription Diet z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food and Purina Pro Plan Veterinary Diets HA Hydrolyzed Protein Chicken Formula Dry Dog 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.