Label analysisGrade DKibble (Extruded)

Hill's

Hill's z/d Low Fat Hydrolyzed Soy Recipe Dry Dog Food | Hill's Prescription Diet

Editor ingredient insight

Hill’s z/d Low Fat Hydrolyzed Soy starts with corn starch, hydrolyzed soy protein, and powdered cellulose, with high protein but very low fat. I would use it for veterinarian-guided low-fat hydrolyzed feeding, not for soy/corn avoidance.

Logic-based verdict

This is a prescription diet for allergy/skin care, so purpose fit comes before standard star ranking.

Manufacturer-independentPublic-data basedIngredients · nutrition · safety

Protein source

Ingredient guide

Ingredient-label protein analysis

Plant protein

Hydrolyzed Soy Protein (#2)

This reads less like a natural meat-forward daily food and more like a therapeutic diet designed to reduce allergy reactions.

If your dog can tolerate other animal proteins, keeping a plant-hydrolyzed diet as a lifelong default is not usually the first choice. Use it under veterinary diagnosis and prescription to check diet response.

Included support ingredients

Nutrient guide

Fish oil

Skin and joint support ingredient

Cranberry

Urinary support ingredient

Taurine

Heart support ingredient

L-carnitine

Heart and weight support ingredient

Omega-3

Skin and joint support ingredient

Omega-6

Skin and coat support ingredient

EPA+DHA

Skin, joint, and heart support ingredient

Vitamin E

Antioxidant and skin support ingredient

View full ingredients
Caution

Ingredient grade

D

Grade D

Top ingredient profile

Corn Starch
Hydrolyzed Soy Protein
Powdered Cellulose
Plant booster present
Crude protein27%
Crude protein27%
Crude fat7.4%
Other 66%

Calcium

0.8%

Phosphorus

0.6%

Sodium

0.4%

Protein position, fat position, and calorie density position are relative to foods in the same processing type cohort.

biotechProtein position
Typical
query_statsFat position
Lower
local_fire_departmentCalorie density
Lower

This is a prescription-diet candidate for allergy/skin care. Read purpose fit and veterinary guidance before treating it as a standard star-ranked food.

Nutritional strengths

  • Omega-3, Omega-6, EPA+DHA, Vitamin E are disclosed, which helps compare skin-barrier and coat-support markers.
  • Crude protein does not drop into a clearly low band.
  • Calorie density is on the lower side.
  • Top ingredients do not show a prominent FDA-investigated non-hereditary DCM ingredient profile.

What still needs work

  • Refined carbohydrates lose fiber, vitamins, and minerals during processing, and mainly act as starch and energy sources. Because of that, our engine reads ingredient quality more conservatively than it would with whole grains.
  • Processed plant protein sits in the top 3, so the crude-protein number clearly includes protein support beyond meat ingredients.
  • Public data is usable, but not at the highest-trust tier.

Alternative foods

allergy/skin care prescription alternatives

Compare allergy/skin care prescription diets first. For therapeutic diets, clinical fit and veterinary direction matter more than a standard score.

8 prescription alternativesKibble (Extruded) · allergy/skin care prescription cohort

Other recipes from the same brand

Other recipes from the same brand with a different purpose or feeding target.

Hill's

i/d Chicken Flavor Dog Food | Hill's Prescription Diet

Adult

Plant-protein boosted

Label score

Special-purpose

Grade C

Hill's

i/d Small Bites Chicken Flavor Dog Food | Hill's Prescription Diet

Adult

Plant-protein boosted

Label score

Special-purpose

Grade C

Hill's

b/d Chicken Flavor Dry Dog Food | Hill’s Prescription Diet

Adult

Label score

Special-purpose

Grade C

Hill's

Gastrointestinal Biome Dry Dog Food | Hill's Prescription Diet

Adult

Plant-protein boosted

Label score

Special-purpose

Grade C

Brand context

Brand background availableRecall history confirmed

Founded in 1907 in the United States. This brand has a confirmed recall history. The most recent public recall noted here was the 2019 vitamin D incident.

Ingredient analysis

This section matters more than usual because the ingredient read is not strong enough to summarize in one line.

restaurantIngredient Quality Analysis

D1.5/6
Ingredient Grade
Conservative
1Corn Starch
Refined Carb · Mid
2Hydrolyzed Soy Protein
Processed Plant Protein · Lowest
3Powdered Cellulose
Fiber Filler · Lower

Ingredient Analysis Comments

  • •Corn Starch is a refined carbohydrate source. It usually reads as a starch and energy source rather than a protein driver. It reads as an mid-tier carb source.
  • •Hydrolyzed Soy Protein is a processed plant-protein booster. It can lift crude protein without the same animal-protein share, so the animal-protein read should stay separate. It reads as an bottom-tier plant protein booster.
  • •Powdered Cellulose reads as a filler-style fiber ingredient. It is harder to count as a stronger quality signal. It reads as an lower-tier carb source.
restaurantIngredient Grade DConservative

Full collected ingredient list

30 ingredients
Corn StarchHydrolyzed Soy ProteinPowdered CelluloseDicalcium PhosphateSoybean OilHydrolyzed Chicken FlavorGround Pecan ShellsCoconut OilLactic AcidPotassium ChlorideFlaxseedGlyceryl MonostearateDried Beet PulpDried Citrus PulpDL-MethionineFish OilCholine ChlorideCalcium SulfatePressed Cranberriesvitamins (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 CarbonateIodized SaltTaurineMagnesium Oxideminerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite)L-TryptophanMixed Tocopherols for freshnessNatural FlavorsL-CarnitineBeta-Carotene.
Primary positive ingredients
Support positive ingredients
Alternative protein
Neutral ingredients
Caution ingredients
High-caution ingredients

Why processed plant proteins are reviewed cautiously

Ingredient lists are ordered by input weight, not protein contribution. Fresh meat 100g and Soybean Meal 50g can both contribute about 20g of protein, and Pea Protein can deliver a similar amount at around 30g. So these ingredients can materially lift crude protein even outside the top three. The review treats processed plant-protein boosters cautiously because they can weaken the animal-protein-centered profile most guardians expect from a high-protein food.

Why did the base review land here?

Ingredient qualityNutrient disclosure levelManufacturing & trust

This review score combines ingredient composition, nutrient disclosure, manufacturing trust, and core nutrient caution signals.

Nutrient disclosure

Partial disclosure

Core guaranteed analysis is usable, but deeper rows still need a more cautious read.

Safety verification

No fails

No major red flag jumps out first, though undisclosed rows still define the limits of this safety read.

Public data trust (ETF)

C1 tier

There is a usable disclosure baseline, but the public record is still fairly thin.

Final word

Treat this review as an early screen. If the food stays interesting, verify it again with your dog-specific context before acting.

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