What happens if I mix different dog foods?

Mixing dog foods is generally fine and does not greatly harm health, but note: different foods vary in composition, so ensure the mix provides full nutrition: protein, fat, carbs, vitamins, and minerals.

Transition gradually to avoid gut upset and diarrhea. Some dogs are allergic to specific ingredients; if mixed with such food, allergy signs appear, so switch to a single food to find the allergen.