PurebitesTuna & Salmon Broth for Cats, Only 5 Ingredients

A fish used mostly in cat foods, where its strong flavor is the point. Tuna is a good protein and a source of omega-3 fats. Two cautions apply to tuna fed often: it is higher in mercury than smaller fish, and cats can become fixated on it and refuse other foods. Both cautions apply to the cat eating tuna every day, and much less to tuna as one ingredient in a complete food fed in rotation.

A fatty fish used as a protein source and as a natural source of omega-3 fats. Fresh salmon is mostly water, so a salmon meal lower on the list may be contributing more protein. Salmon is a common alternative protein for pets that react to chicken or beef, though fish allergies exist too. Farmed and wild salmon differ in fat profile, and labels rarely say which.

Usually tomato pomace, the skins, pulp and seeds left after juicing, added as a fiber source with some antioxidants. Ripe tomato is safe for pets; the green parts of the plant, which are not used in pet food, contain compounds that are toxic in quantity. Pomace is an inexpensive and reasonably good fiber, and that is all it is doing here.

A leafy green added in small amounts for vitamins, minerals and color. Spinach is high in oxalate, which binds calcium and in large quantities is a concern for pets prone to calcium oxalate bladder stones. The amounts in a complete food are tiny, often a fraction of a percent, so for most pets it is a token vegetable with no nutritional or safety weight.