I have two very lean Yorkies in the range of 14.5 - 15.5 lbs. It's not a problem and you don't need to do anything special with his diet. They just eat a little more than a standard size Yorkie.
__________________ Life is merrier with a Yorkshire Terrier! Jezebel  & Chuy ... RIP: Barkley  Loosie & Sassy  |