Grannicks Bitter Apple Original Spray for Dogs is a non-toxic, safe and effective chew deterrent. Has a bitter taste to discourage pets from licking, gnawing and chewing on surfaces where applied. Stops pets from biting and chewing fur, wounds and bandages. Bitter Apple for dogs is available in a variety of sizes: 8 oz. Spray, 16 oz. Spray, 16 oz. Refill and 32 oz. Refill.