HILL'S PRESCRIPTION DIET · REVIEW
Hill's Prescription Diet z/d Allergy Original
Hill's Prescription Diet z/d Allergy Original scores 2.0/5 for ingredient quality — a dry food cat food with 32% protein targeting adult cats.
Below Average
MiauMiau AI score · 2.0/5
AI ANALYSIS
What MiauMiau's AI actually sees
The first ingredient is 'Cereals' (grains), and the protein relies heavily on rice protein concentrate and hydrolyzed chicken liver, with vague 'vegetable protein extracts' and 'meat and animal derivatives'—this is poor for an obligate carnivore. While the dry matter protein is 34.0% (marginal), the estimated carbohydrate load is very high at 41.2% DMB, driven by brewers' rice and cereals as the primary components.
According to MiauMiau's analysis of over 5,000+ 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 · June 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 Allergy Original vs. the category
Compared to the average dry food across 5,000+ products in our database.
Category avg: 2.7/5
Scores 0.7 points below the average dry food
OUR ASSESSMENT
What we like vs. what to watch
What we like
- Clean formula with no controversial additives
- 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
- 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 Allergy Original good for cats?
According to MiauMiau's AI analysis, Hill's Prescription Diet z/d Allergy Original is a below-average dry food with a quality score of 2.0 out of 5. The first ingredient is 'Cereals' (grains), and the protein relies heavily on rice protein concentrate and hydrolyzed chicken liver, with vague 'vegetable protein extracts' and 'meat and animal derivatives'—this is poor for an obligate carnivore. While the dry matter protein is 34.0% (marginal), the estimated carbohydrate load is very high at 41.2% DMB, driven by brewers' rice and cereals as the primary components.
What is the protein content of Hill's Prescription Diet z/d Allergy Original?
Hill's Prescription Diet z/d Allergy 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 Allergy Original grain-free?
Yes, Hill's Prescription Diet z/d Allergy 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 Allergy Original compare to other dry food?
According to MiauMiau's database of over 5,000+ cat food products, Hill's Prescription Diet z/d Allergy Original scores 0.7 points below the average dry food quality score of 2.7. MiauMiau's AI evaluates ingredient quality, protein adequacy, filler content, and additive safety to generate each score.
Is Hill's Prescription Diet z/d Allergy Original suitable for kittens or senior cats?
Hill's Prescription Diet z/d Allergy 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 Allergy Original?
The top 5 ingredients in Hill's Prescription Diet z/d Allergy 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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