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Most dog foods on the market today are meant to be the only source of nutrition for our dogs. You will find the words “complete and balanced” printed on back of the bag. Foods must meet nutritional standards established by the Association of American Feed Control Officials (AAFCO). It is important to note that a dog food that meets AAFCO standards is not necessarily precisely balanced. To prove they are healthy, foods must either be made from a recipe that meets certain requirements, or they must be put through a special feeding trial.