Here is just one of the many articles I’ve read that explains why wet food is actually better than dry food.
I’m feeding half and half right now but trying to slowly decrease the dry food.
I hope you get CJ’s diarrhea under control.

• Dental Disease: Long-standing claims that cats have less dental disease when they are fed dry food versus canned food are grossly overrated, inaccurate, and are not supported by recent studies. Many veterinarians are coming to the realization that this is a myth that needs to be dispelled. First, dry food is hard, but brittle, and merely shatters with little to no abrasive effect on the teeth. Second, a cat's jaws and teeth are designed for shearing and tearing meat, and cats that eat dry food grind it in a way that it ends up between their teeth. There it ferments into sugar and acid, thereby causing dental problems. Third, many cats swallow the majority of their dry food whole and thus receive minimal benefit from chewing motion. There are many factors that contribute to dental disease in the cat such as genetics, viruses, and diet. There remain many unanswered questions concerning the impact of diet on dental health, but feeding a high carbohydrate, species-inappropriate dry kibble diet is a negative factor, not a positive one.

http://cats.about.com/gi/dynamic/off...rg%2Findex.htm