Well, DUH!!!! I didn't even THINK to ask you whether or not you change the litter. That is probably your problem. Cats don't like change. I use Feline Pine, which are pine pellets. If the cat is used to that, I'd find out where the breeder got it and go get some. I'll be you once he's back to his old litter, the whole thing will turn out well.

Good luck and keep us posted.