Catgut (also known as gut) is a type of cord[1] that is prepared from the natural fiber found in the walls of animal intestines.[2] Catgut makers usually use sheep or goat intestines, but occasionally use the intestines of cattle,[3] hogs, horses, mules, or donkeys.[4] Despite the name, catgut is not made from cat intestines.
[T]here is no such thing as crude catgut or catgut unmanufactured. Catgut is a manufactured article and a finished product; the crude form are the intestines or guts of sheep or other animals.
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Catgut sutures are made from the submucosal layer of the small intestine of sheep and the serosal layer of the small intestine of cattle.