Hot dogs are not actually made out of pig snouts or meat scraps left on the floor, which is a very popular belief. They are usually made of a blend of meats, usually chicken, beef, pork, or turkey and then meat fat, oatmeal, bread crumbs, various seasonings, and other ingredients. They are then mushed together and put into hot dog molds. Store bought hot dogs are put into cellulose casings, but homemade are usually made of intestines.