Try warming up his wet food a little bit and see if that entices him to eat a bit. Also, you can try plain meat baby food (beef, chicken, or turkey). That might entice him to eat some wet food. It would be good if you could get some canned food into him. He may be constipated because of the dry food only, but not sure. You could also try offering him some plain canned pumpkin, not the pumpkin pie spice. Just about a teaspoon twice a day might help get things moving.