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Brand Comparison · 2026

Hill's Science Diet vs Nutro

Hill's Science Diet (veterinarian-recommended premium kibble with the deepest prescription-diet portfolio on the market) and Nutro (premium-tier kibble from Mars Petcare, a maker that meets 4 of WSAVA's 5 questions) compared head-to-head on WSAVA manufacturer-quality criteria, AAFCO substantiation, monthly cost, and which dog each is best for in 2026. Hill's Science Diet meets 5 of 5 WSAVA criteria. Nutro is roughly 11% less than Hill's Science Diet.

The verdict

Hill's Science Diet meets all 5 WSAVA questions and Nutro meets 4 of 5. The one-point gap comes from feeding trials. Nutro's FAQ says all recipes are "formulated to meet" AAFCO profiles, with no feeding-test claim, while Hill's backs its diets with AAFCO feeding tests and 50+ years of trial data. Prices are close: Hill's costs $55-85/month and Nutro costs $55-70/month. Nutro's FAQ lists owned dry-food factories in Henderson, NC and Victorville, CA.

Since the prices nearly match, the choice turns on what you value. Hill's offers the clinical record and an easy step into Prescription Diet if a veterinarian ever recommends one. Nutro offers a premium kibble from Mars Petcare with published testing and HACCP. For a healthy adult whose owner wants trial-backed labeling, Hill's is the better fit. A veterinarian should guide any medical diet.

Key differences at a glance

Quick comparison

DimensionHill's Science DietNutro
Parent companyColgate-PalmoliveMars Petcare
CategoryPremium dry kibblePremium dry kibble
WSAVA criteria met5 of 54 of 5
AAFCO substantiationFeeding trialsFormulation only
Full-time veterinary nutritionistYesYes
Credentialed formulatorYesYes
AAFCO feeding trialsYesNo
Owns manufacturing plantsYesYes
Quality control programYesYes
Typical monthly cost (50 lb dog)$55 – $85 / month$55 – $70 / month

Colgate-Palmolive

Hill's Science Diet

Veterinarian-recommended premium kibble with the deepest prescription-diet portfolio on the market.

Strengths

  • Most extensively used brand in US veterinary clinical practice
  • 50+ years of feeding trial data from an owned research facility
  • Strong palatability across life stages
  • Pairs cleanly with Hill's Prescription Diet for any future therapeutic needs

Watch-outs

  • Higher price than Purina Pro Plan at comparable nutritional spec
  • Less breed-specific formulation than Royal Canin
  • Vitamin D toxicity recall in 2019 affected canned formulas

Best for: Healthy adult dogs where you want continuity from over-the-counter to prescription within a single brand.

Avoid if: You are highly price-sensitive and your dog has no medical conditions.

Visit Hill's Science Diet ↗

Mars Petcare

Nutro

Premium-tier kibble from Mars Petcare, a maker that meets 4 of WSAVA's 5 questions.

Strengths

  • Meets 4 of WSAVA's 5 questions through Mars Petcare's named PhD nutrition scientists
  • Its FAQ lists owned dry-food factories in Henderson NC and Victorville CA, though a February 2025 report says Henderson is making Iams again
  • Publishes testing, HACCP and on-site quality experts for all Nutro facilities

Watch-outs

  • The FAQ says all recipes are "formulated to meet" AAFCO profiles, with no feeding-test claim
  • No Nutro page says who formulates the recipes, so the credit comes from Mars Petcare's staff
  • Costs more than Pedigree or Iams
  • Named in 10 reports in the FDA's 2019 DCM update. The FDA did not establish that any food caused the disease

Best for: Healthy adult dogs whose owners want premium-tier kibble from a maker that meets 4 of WSAVA's 5 questions.

Avoid if: You want feeding-trial substantiation on the label or are on a tight budget.

Visit Nutro ↗

Which is better for your dog?

The right pick depends on your individual dog. Hill's Science Diet is the better choice when: Healthy adult dogs where you want continuity from over-the-counter to prescription within a single brand. Nutro is the better choice when: Healthy adult dogs whose owners want premium-tier kibble from a maker that meets 4 of WSAVA's 5 questions.

On cost, Nutro is roughly 11% less than Hill's Science Diet at the midpoint of typical premium spec for a 50 lb adult dog. On WSAVA manufacturer-quality criteria, Hill's Science Diet meets 5 of 5 vs 4 of 5 for Nutro.

Checking one brand rather than the pair? See is Hill's Science Diet WSAVA-approved or is Nutro WSAVA-approved.

Where to buy

Made your pick?

Check current pricing on whichever brand fits your dog. Prices and promotions change frequently, so it is worth comparing both before you commit to a bag or a subscription.

Shop Hill's Science Diet on Chewy →Shop Nutro on Chewy →

Disclosure: these are affiliate links and IntelliBowl may earn a commission at no extra cost to you. Commission does not influence the comparison above. See our methodology.

Personalized recommendation

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Compare these brands against others

Methodology: WSAVA criteria reflect each brand's publicly documented manufacturer-quality practices as of October 2026, scored against the WSAVA Global Nutrition Committee's 5-question rubric. AAFCO substantiation reflects the dominant method used across the brand's main retail product line. Monthly cost reflects typical US 2026 retail for a 50 lb adult dog at premium spec, before autoship discounts. Recommendations are editorial and not influenced by affiliate relationships. See our recommendation methodology for IntelliBowl's quiz-engine ranking logic.