I have a cat who sucks on the end of his tail. I have tried spraying it with bitter apple to deter him, but it's not working. Is there another kind of spray that will deter him without hurting him?
No,
He is sucking his tail, because he was weaned too early. Frankly, I would just let it happen and he will grow out of it. It's okay, he just misses his mommy.