HILL'S PRESCRIPTION DIET · REVIEW
Hill's Prescription Diet y/d Thyroid Health
Hill's Prescription Diet y/d Thyroid Health scores 1.6/5 for ingredient quality — a dry food cat food with 33.5% protein targeting adult cats.
Poor
MiauMiau AI score · 1.6/5
AI ANALYSIS
What MiauMiau's AI actually sees
This is a poor-quality food for an obligate carnivore. The first ingredient is 'Vegetable protein extracts' (plant-based), followed by 'Cereals', while 'Meat and animal by-products' appears only after Minerals, indicating very low reliance on animal-sourced protein.
According to MiauMiau's analysis of over 5,000+ dry food products, Hill's Prescription Diet y/d Thyroid Health 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 y/d Thyroid Health vs. the category
Compared to the average dry food across 5,000+ products in our database.
Category avg: 2.7/5
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
WHO IT'S FOR
Is this right for your cat?
Best for
INGREDIENTS
What's actually in the bag
Top ingredients
- 01Vegetable protein extracts
- 02Cereals
- 03Oils and fats
- 04Eggs and egg products
- 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
FULL LABEL
Every ingredient
Vegetable protein extracts, Cereals, Oils and fats, Eggs and egg products, Minerals, Meat and animal by-products, Seeds.
FAQ
Questions worth answering
Is Hill's Prescription Diet y/d Thyroid Health good for cats?
According to MiauMiau's AI analysis, Hill's Prescription Diet y/d Thyroid Health is a below-average dry food with a quality score of 1.6 out of 5. This is a poor-quality food for an obligate carnivore. The first ingredient is 'Vegetable protein extracts' (plant-based), followed by 'Cereals', while 'Meat and animal by-products' appears only after Minerals, indicating very low reliance on animal-sourced protein.
What is the protein content of Hill's Prescription Diet y/d Thyroid Health?
Hill's Prescription Diet y/d Thyroid Health contains 33.5% protein as listed on the label.
Is Hill's Prescription Diet y/d Thyroid Health grain-free?
Yes, Hill's Prescription Diet y/d Thyroid Health 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 y/d Thyroid Health compare to other dry food?
According to MiauMiau's database of over 5,000+ cat food products, Hill's Prescription Diet y/d Thyroid Health scores 1.1 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 y/d Thyroid Health suitable for kittens or senior cats?
Hill's Prescription Diet y/d Thyroid Health 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 y/d Thyroid Health?
The top 5 ingredients in Hill's Prescription Diet y/d Thyroid Health are: Vegetable protein extracts, Cereals, Oils and fats, Eggs and egg products, Minerals. The primary ingredient is Vegetable protein extracts. The remaining top ingredients are Cereals, Oils and fats, Eggs and egg products, Minerals. Ingredient order indicates proportion by weight, so the first ingredients make up the bulk of the formula.
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