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Hill's Science Diet vs Iams

Hill's Science Diet is made by Hill's Pet Nutrition (owned by Colgate-Palmolive Company), and Iams by Iams Company (owned by Mars, Incorporated), and both make food for cats and dogs. On KibbleLab, Hill's Science Diet averages 8.6 out of 10 across its scored foods, compared with 8.1 for Iams. Hill's Science Diet is accredited by the Pet Sustainability Coalition; Iams is not.

Hill's Science Diet and Iams compared

Hill's Science Diet Iams
Manufacturer Hill's Pet Nutrition Iams Company
Parent company Colgate-Palmolive Company Mars, Incorporated
Founded 1907 1946
Headquarters Topeka, Kansas, USA Mason, Ohio, United States
Products listed 73 48
Serves Cats & dogs Cats & dogs
Price tier A relative price guide, from $ (most affordable) to $$$$$ (most premium), based on the brand's typical retail cost.
$$$$ $$$
WSAVA guidelines The World Small Animal Veterinary Association (WSAVA) 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
Score The average KibbleLab score across this brand's scored foods, on a 0 to 10 scale. Foods are scored on published veterinary science, and no one can pay for a higher score. How scoring works .
8.6 (avg of 73) 8.1 (avg of 48)
Recalls on record KibbleLab began logging recalls in July 2026, so earlier recalls may not appear.
None None
Where to buy Amazon Amazon

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Hill's Science Diet vs Iams: how they compare

Scores

Hill's Science Diet scores higher on KibbleLab, averaging 8.6 out of 10 across 73 scored foods, compared with 8.1 across 48 for Iams. Scores apply the same criteria-based rubric to every food, drawn from published veterinary science, and no one can pay for a higher score.

Who makes them

Hill's Science Diet is made by Hill's Pet Nutrition, owned by Colgate-Palmolive Company, based in Topeka, Kansas, USA, founded in 1907. Iams is made by Iams Company, owned by Mars, Incorporated, based in Mason, Ohio, United States, founded in 1946.

Standards and range

Both meet WSAVA's published manufacturer criteria. Hill's Science Diet is accredited by the Pet Sustainability Coalition; Iams is not. KibbleLab lists 73 Hill's Science Diet foods and 48 Iams foods.

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Common Questions

Which scores higher on KibbleLab, Hill's Science Diet or Iams?

Hill's Science Diet scores higher: it averages 8.6 out of 10 across 73 scored foods, compared with 8.1 for Iams. Scores reflect published veterinary science, and no one can pay for a higher score.

Who makes Hill's Science Diet and Iams?

Hill's Science Diet is made by Hill's Pet Nutrition, which is owned by Colgate-Palmolive Company. Iams is made by Iams Company, which is owned by Mars, Incorporated.

Which brand has more products on KibbleLab?

Hill's Science Diet has 73 products in the KibbleLab database, compared with 48 for Iams.

Where is each brand based?

Hill's Science Diet is based in Topeka, Kansas, USA. Iams is based in Mason, Ohio, United States.

Do Hill's Science Diet and Iams meet WSAVA criteria?

Both Hill's Science Diet and Iams meet WSAVA's published criteria for evaluating a manufacturer. WSAVA publishes criteria; it does not certify or endorse brands.

Are Hill's Science Diet or Iams PSC Accredited?

Hill's Science Diet is a PSC Accredited business. The Pet Sustainability Coalition is a nonprofit that Accredits pet companies on their environmental and social impact, through third-party verification.

Have Hill's Science Diet or Iams been recalled?

Neither Hill's Science Diet nor Iams has a recall on record in the KibbleLab database. KibbleLab began logging recalls in July 2026, so earlier recalls may not appear.

See the full profiles: Hill's Science Diet and Iams .

More comparisons

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 brand. KibbleLab may earn affiliate commissions through links. No one can pay for placement or a higher score.

Brand and manufacturer details are compiled from public sources and not independently verified; they may not reflect contract manufacturing or co-packing. Recall data is compiled from public FDA and manufacturer notices, and a notice may name the parent company rather than the brand. KibbleLab began logging recalls in July 2026, so earlier recalls may not appear.

KibbleLab scores and commentary are editorial opinions based on published data. Represent one of these brands? Request a correction. Anyone else can email us. See our Terms.