The scores
Purina ONE +Plus Healthy Puppy: C (62/100) — Chicken, rice flour, corn gluten meal, chicken by-product meal, whole grain corn. Fish oil for DHA, glucosamine from by-product meal.
Purina Puppy Chow Complete: D (39/100) — Chicken by-product meal, corn, whole grain wheat, corn gluten meal, animal fat. Caramel color, artificial dyes, budget-shelf formulation.
How the ingredients compare
Purina ONE: Chicken, Rice Flour, Corn Gluten Meal, Chicken By-Product Meal, Whole Grain Corn
Puppy Chow: Chicken By-Product Meal, Corn, Whole Grain Wheat, Corn Gluten Meal, Animal Fat
The defining difference is at the very top. Purina ONE leads with real chicken (fresh poultry, ~80% moisture) — a meaningful wet-weight animal protein anchor. Puppy Chow leads with chicken by-product meal (rendered organs, bone, and trim), which is concentrated but undifferentiated. Rice flour at position two in ONE is a more digestible starch source than the corn that anchors Puppy Chow's carbohydrate base. Both formulas include corn gluten meal (for plant-protein inflation) but Puppy Chow's total corn load across multiple ingredients is substantially higher.
Where Purina ONE Puppy pulls ahead
Real chicken as the first ingredient: This is the most consequential difference. Fresh chicken carries amino acid completeness and digestibility advantages that by-product meal alone cannot match. AAFCO allows both, but the nutritional hierarchy is clear — named animal ingredients outperform by-product meals on biological value and bioavailability.
Fish oil as a dedicated DHA source: Puppies need DHA during the first 12 months for brain and retinal development. Purina ONE includes fish oil as a named ingredient specifically labeled as a DHA source. Puppy Chow includes fish oil further down the ingredient list at lower inclusion rates. For cognitive development specifically, ONE is the safer bet.
No caramel color or artificial dyes: Purina ONE uses caramel color (a cosmetic additive) but does not layer additional artificial food dyes. Puppy Chow includes multiple artificial colors (Yellow 5, Yellow 6, Red 40, Blue 2 in various batches) — these serve no nutritional purpose and some pet owners prefer to avoid them.
Mineral form upgrade: Purina ONE uses some mineral sulfates alongside proteinate forms for zinc and copper. Puppy Chow relies more heavily on simpler sulfate forms throughout. Chelated mineral forms are more bioavailable — a meaningful nutritional efficiency difference. Shop on Amazon →
Where Puppy Chow holds its own
Price point: Purina Puppy Chow is one of the least expensive puppy formulas on the major-chain shelf. For households on truly tight budgets, it delivers AAFCO-compliant puppy growth nutrition at a price Purina ONE can't match. "Adequate" is a lower bar than "optimal," but it's still adequate.
Glucosamine via chicken by-product meal: Puppy Chow includes chicken by-product meal in large quantity as the first ingredient, which carries natural glucosamine content. The dose is variable and unmeasured, but it's present. For budget-constrained owners of large-breed puppies, this is a small positive.
AAFCO puppy growth compliance: Puppy Chow is legally compliant with AAFCO puppy growth nutrient minimums. It will not cause malnutrition or developmental deficiency under normal feeding. The quality question is about what's above the floor — not whether the floor is met. Shop on Amazon →
The bottom line
The 23-point gap is a real quality differential that justifies the modest price step-up from Puppy Chow to Purina ONE. Purina ONE +Plus Healthy Puppy (C/62) delivers real chicken as the first ingredient, dedicated DHA from fish oil, and a cleaner artificial-additive profile than Purina Puppy Chow (D/39). If you're already shopping Purina for a puppy, ONE is the version to pick. If the budget can stretch further, Iams Smart Puppy (B/75) and Blue Buffalo Life Protection Puppy (B/78) offer another clear ingredient-quality step up at mid-tier prices. For truly tight budgets where Puppy Chow is the only option, the formula is adequate — just not aspirational.