Hello! I have a cat that will not do his "business" in the litter box. He prefers to go in the bathtub and even tries to cover it up by scratching the side or the inside of the tub. I don't understand this because the litter is always clean and there are more than one so its not that he doesnt have easy access to them. I don't understand why he does this and don't want to yell at him or punish him for this until I know why he does this.... PLEASE HELP!!! Thank You!