I have a 3 1/2 month old mini dachshund that I got about two weeks ago. The vet said he was pretty thin and to let him have as much food as he wanted. I have but he doesn't eat much. He still seems really thin - his ribs feel like there's nothing but fur and bone. He's on dry food and that's what I want to keep him on full time, but should I give him some wet food for a few weeks? Would that help to fatten him up, and would it be a problem to stop giving it to him later?