We are in the midst of moving from an rural area in Charles County to Wildewood. We have a wonderful cat, however, he spends more time outside than inside. He has never learned to use a litter box and when he has to go he goes outside somewhere. My concern is letting him wander around instead of staying inside. He'll go just about bananas if he has to stay in and I'm concerned that he won't use a litter box. Anyone have an idea about how to convert him . . . gently?