Taste deterrent for dogs. Maintains coat in salon show perfection. No more fur biting, hair chewing, or skin scratching. Protects fabrics.An indispensable dog-training tool, Bitter Apple Spray was invented by a pharmacist in 1960. To discourage biting, chewing and other unwanted behavior, just spray items with Bitter Apple. It's harmless to dogs and doesn't leave a stain, but the powerful taste deterrent sends a strong message to your dog. This formula can also be sprayed directly on your dog to discourage hair chewing and hot spots.