Bil JacAmerica's VetDogs® Skin & Coat Soft Treats

The most common protein in pet food, and for dogs one of the most common food allergens, with beef and dairy. If chicken is what your pet reacts to, it hides everywhere: chicken fat, chicken broth, chicken meal, natural flavor. On a label, chicken listed first is weighed with its water still in, so a food leading with fresh chicken often has less chicken protein than one leading with chicken meal. Neither is better; they are different measures.

Almost always rosemary extract, used as a natural antioxidant to keep fats fresh, usually alongside mixed tocopherols. The amounts are tiny. A persistent internet claim links rosemary to seizures in dogs; there is no published evidence for it at food levels. If your dog has epilepsy, ask your neurologist rather than avoiding foods on this basis alone.

An extract added in tiny amounts for its antioxidant compounds, and in some dental treats for breath. The caffeine content is the only real question, since caffeine is toxic to pets in quantity; the extract is usually decaffeinated or used in amounts too small to matter. There is no evidence the levels in a pet food produce any health effect. It is a marketing ingredient, safe at food levels.