Hello everyone.. I have a question. my Yorkie is a year and is very skinny. When I bought him he was skinny, and wouldn't eat his food Pro Plan toy Breed Formula until i mixed it with Pedigree a soft food. I eventually took him off and put him on Nuto Choice which he does well with but he is not putting on any weight and his rear bones are showing.. He eats 3 times a day. Even my neighbors yorkie is plumper than mines...and they are the same height. Mines is a t-cup. how do I help him put on a little more weight...without over feeding him.