Abstract: A canine cervical jacket is disclosed comprising a fabric cover adapted to be mounted over the dog's back with a pair of openings for receiving the animal's legs. A removable, foam plastic body is disposed in the jacket and has a sufficient stiffness to prevent the dog from bending around to bite his hind quarters.The jacket is useful either as a alternative to surgery, or as a post surgical aid.The jacket has sleeves for receiving several elongated stiffener members along the dog's spine that prevent or restrict the dog from moving his head with respect to his body, but permit him to bend at the thoracic and lumbar area for feeding and the like.