What Dog Food Do AI Models Recommend (2026)?

Key Takeaway

For a Labrador owner, AI routes to Purina Pro Plan, Royal Canin, and Hills Science Diet in every engine that names brands, on institutional-credibility grounds rather than ingredient quality - and every engine actively warns against the boutique grain-free positioning that most challenger brands are built on. Claude declined to name any brand at all on the discovery prompt, the first zero-brand response recorded. Diamond Naturals is the one challenger with genuine cross-model presence, and it wins on the value prompt in all four engines.

Top Brands Summary

Purina Pro Plan, Royal Canin, and Hills Science Diet remain the three-brand core, appearing across every engine that named brands. Diamond Naturals is the universal budget pick, surfacing in all four engines' value prompts, and Purina ONE holds the budget slot for ChatGPT and Gemini. Taste of the Wild and Wellness appear in Claude and Perplexity; Iams and Eukanuba hold ChatGPT's value and active-dog tiers. The single most notable event this run: Claude's discovery prompt (P1) named ZERO brands - it explicitly declined to give a best-brands list, citing changing quality, recalls, and reformulations, and redirected the buyer to AAFCO adequacy statements, WSAVA evaluation questions, and body-condition scoring instead. That is a brand-recommendation refusal in a category with an active safety controversy, and it is the first zero-brand response recorded in any category.