The answer is different for each pet depending on the lifestyle and life stage of the pet, although many commercially available foods are fine to feed healthy dogs and cats. You can look for a nutritional adequacy statement from the Association of American Feed Control Officials (AAFCO), as well as the words “complete and balanced”. Pets’ nutritional needs do change, depending on their life stage and health. Your veterinarian can recommend a pet food, as well as give you advice on deciphering ingredient lists and determining how much to feed your pet.