Over the past forty years Bitter Apple has grown into a full line of taste-deterrents for pets. Many copycat products have come and gone because pets soon acquire a taste for them. Only Grannicks Bitter Apple works and keeps working. Bitter Apples success as a dog-training aid and habit-breaker is legendary among professional trainers. Every day more veterinarians, trainers and pet lovers around the world discover the benefits of Grannicks Bitter Apple products. This particular refill taste deterrent discourages fur biting, hair chewing and hot spots. Contents filled with water, isopropanol 5%, bitter principles and extractives.