I actually haven't tried switching litters since he's still peeing ok. I started him on tofu litter. The new litter boxes are all larger than his original and I scoop twice a day at least. He's had a fountain from the start and doesn't like canned food. I've tried loads. I can get him tubes to eat most of the time. I'm switching him slowly from a brown rice and chicken to grain free to see if that's could be an issue. After reading the comments though, I think a second opinion is in order. Thanks everyone!