How can a cat that is on mostly wet food, (only a sprinkling of dry with his wet) still get a UTI and blockage. Is it possible that a canned food diet that consists of largely fish (they prefer them over the chicken and turkey varieties) is the cause? I have a Maine Coone male that is 3 years old and he is now at the ER. I feed him the 5 varities of Natural Balance from Pet Valu. 3 of the 5 are fish, and another is fish based, but not actually called fish. The dry is a good quality grain free, but he gets very little of this. I am at a loss and do not want to go thru this again as the expense is prohibitive. any thoughts?