Grannick's Bitter Apple Spray for Dogs. Prevent your pet from fur biting and chewing and from aggravating hot spots by applying Grannick's Bitter Apple. This highly effective spray offers a unique and strong taste deterrent that will break your pup of the habit of biting, chewing and otherwise irritating skin. Features: Same unique taste deterrent formulated by a Pharmacist in 1960 Intended For: Dogs