I have a half grown cat. He easily trained to the liter box. However, because he was making such a mess dragging the litter out of the box, I changed litters to see if that would help. He stopped using the litter box. Now he won't use a litter box regardless of the type of litter. He uses the shower stall, a carpeted area at the end of the hall, any carpeted area. He fights me when I try to put him in the box. I have two different boxes. He won't use either of them. I have tried deodorizing the areas he uses. Nothing works. Help! My house stinks.