HILL'S PRESCRIPTION DIET · REVIEW
Hill's Prescription Diet z/d Cat Food Original
Hill's Prescription Diet z/d Cat Food Original scores 1.5/5 for ingredient quality — a dry food cat food with 32% protein targeting adult cats.
Poor
MiauMiau AI score · 1.5/5
AI ANALYSIS
What MiauMiau's AI actually sees
This prescription diet prioritizes allergen management via hydrolyzed liver but fails significantly as a carnivore-appropriate food due to 'Cereals' being the primary ingredient. The high 41.2% carbohydrate load and lack of transparency regarding specific additives make this a poor nutritional choice for healthy cats.
According to MiauMiau's analysis of over 2,700+ dry food products, Hill's Prescription Diet z/d Dry Cat Food Original scores below the dry food average.
Analyzed by MiauMiau's Nutritional AI · April 2026
This analysis is generated from ingredient and compositional data. It is not veterinary advice. Always consult your veterinarian for health decisions.
Score breakdown
HOW IT COMPARES
Hill's Prescription Diet z/d Cat Food Original vs. the category
Compared to the average dry food across 2,700+ products in our database.
Category avg: 2.6/5
Scores 1.1 points below the average dry food
OUR ASSESSMENT
What we like vs. what to watch
What we like
- Grain-free formula
- Nutritionally complete — suitable as a sole diet
What to watch
- Ingredient quality is below average
- Protein content falls short of optimal levels
- Contains notable filler ingredients
- Contains some controversial additives
- Uses vague 'derivatives' instead of named ingredients
- High carbohydrate content relative to protein
WHO IT'S FOR
Is this right for your cat?
Best for
Not ideal for
INGREDIENTS
What's actually in the bag
Top ingredients
- 01Cereals
- 02vegetable protein extracts
- 03meat and animal derivatives
- 04oils and fats (fish oil 1%)
- 05minerals
Ingredients are listed by weight. The first ingredients make up the majority of the formula.
Concerns
- Uses unnamed animal derivatives instead of specific protein sources
NUTRITION
The numbers
Guaranteed analysis
Dry matter basis
Dry matter basis removes water content for accurate comparison between wet and dry foods.
FULL LABEL
Every ingredient
Cereals, vegetable protein extracts, meat and animal derivatives, oils and fats (fish oil 1%), minerals, derivatives of vegetable origin, fruit, seeds. Protein sources: Rice protein concentrate, chicken liver hydrolysate (15.1%). Carbohydrate source: Brewers' rice.
FAQ
Questions worth answering
Is Hill's Prescription Diet z/d Cat Food Original good for cats?
According to MiauMiau's AI analysis, Hill's Prescription Diet z/d Cat Food Original is a below-average dry food with a quality score of 1.5 out of 5. This prescription diet prioritizes allergen management via hydrolyzed liver but fails significantly as a carnivore-appropriate food due to 'Cereals' being the primary ingredient. The high 41.2% carbohydrate load and lack of transparency regarding specific additives make this a poor nutritional choice for healthy cats.
What is the protein content of Hill's Prescription Diet z/d Cat Food Original?
Hill's Prescription Diet z/d Cat Food Original contains 32% protein as listed on the label. On a dry matter basis, that's 34.04% protein. Dry matter basis is the fairest way to compare protein between wet and dry foods because it removes water content from the equation.
Is Hill's Prescription Diet z/d Cat Food Original grain-free?
Yes, Hill's Prescription Diet z/d Cat Food Original is grain-free. It does not contain wheat, corn, rice, or other grain ingredients. This can be beneficial for cats with grain sensitivities, though most healthy cats tolerate grains without issues.
How does Hill's Prescription Diet z/d Cat Food Original compare to other dry food?
According to MiauMiau's database of over 2,700+ cat food products, Hill's Prescription Diet z/d Cat Food Original scores 1.1 points below the average dry food quality score of 2.6. MiauMiau's AI evaluates ingredient quality, protein adequacy, filler content, and additive safety to generate each score.
Is Hill's Prescription Diet z/d Cat Food Original suitable for kittens or senior cats?
Hill's Prescription Diet z/d Cat Food Original is formulated for adult cats. If you have a kitten or a senior cat, look for formulas specifically designed for their life stage.
What are the main ingredients in Hill's Prescription Diet z/d Cat Food Original?
The top 5 ingredients in Hill's Prescription Diet z/d Cat Food Original are: Cereals, vegetable protein extracts, meat and animal derivatives, oils and fats (fish oil 1%), minerals. The primary ingredient is Cereals. The remaining top ingredients are vegetable protein extracts, meat and animal derivatives, oils and fats (fish oil 1%), minerals. Ingredient order indicates proportion by weight, so the first ingredients make up the bulk of the formula.
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