Starsky is 9 lbs 6 oz and he is skinny! He has longer then normal legs and a longer body. He is very active around the house and the back yard. I feed him about 1/2 cup twice a day. Some days he may eat more or less. Plus he gets a small treat twice a day. You may just have a bigger yorkie. Just make sure you can still feel his ribs. I think most of Starsky's weight is in his hind legs. They are sure muscluler from all the running and jumping he does.