Fussie CatChicken Purée

A thickener made by fermenting sugar with a bacterium. It gives wet foods their gravy and keeps ingredients from separating in the can or pouch. It has no nutritional role, is not digested, and is used in very small amounts. Pets on a strict elimination diet may be asked to avoid gums, which is about keeping the diet simple. The gum itself is not a hazard.

A zinc source. Zinc is essential for skin, coat, immunity and wound healing, and deficiency shows up first as crusty skin. Some Arctic breeds absorb it poorly and need more. Sulfate and oxide are inorganic; proteinate or chelate is bound to protein, which brands present as better absorbed. Any of them is normal. Not an allergen.

An amino acid cats cannot make in sufficient quantity and must eat, or they develop heart disease and blindness. It is in every complete cat food by law of nutrition, not by choice. Dogs make their own, but it is added to many dog foods as a precaution after a federal investigation into diet-associated heart disease in dogs. Its presence on a dog food label is a good sign, not a warning.

A fat-soluble antioxidant that protects cells and the fats in the food itself. It is in nearly every complete food, both as a nutrient and, under the name mixed tocopherols, as the natural preservative that keeps fat from going rancid. Deficiency is rare in pets eating a complete diet. Nothing to worry about on a label, and a sign the maker is preserving with vitamin E rather than synthetic chemicals.