Meat 用法根據 AAFCO 的定義如下：
Meat: the clean flesh derived from slaughtered mammals and limited to that part of the striate muscle which is skeletal or that part which is found in the tongue, in the diaphragm, in the heart or in the esophagus; with or without the accompanying and overlying fat and portions of the skin, sinew, nerve and blood vessels which normally accompany the flesh. It shall be suitable for animal food. If it bears a name descriptive of its kind, it must correspond thereto.
In other words, meat is primarily the muscle tissue of the animal, but may include fat, gristle and other tissues normally accompanying the muscle, similar to what is sometimes seen in raw meat sold for human consumption. This may include the less appealing cuts of meat, including the heart muscle and the muscle that separates the heart and lungs from the rest of the internal organs, but it is still muscle tissue.
However, it does not include bone. Meat for pet food often is “mechanically separated,” meaning machines strip the muscle from the bone. This results in a finely-ground product with a paste-like consistency (similar to what is used in hot dogs).
如果你在貓狗糧的包裝標籤看到 Beef（牛）、 Chicken（雞）、 Duck（鴨）等字眼，代表貓狗糧是用該動物之肌肉群製成的。