[RLC12345678]

Hootie really needs to gain some weight. She is so tiny and frail. She weighs 3.6lbs and I would like to get her up to about 4lbs. What can I do to facilitate this?? She eats Natural Balance and I alternate between the Duck & Potato and Sweet Potato & Fish flavors. I free feed and she eats about 1/2 cup a day, which I feel is a pretty good amount. Hobbs eats the same amount and he is a good weight. At this point I don't give any treats. I don't mind giving treats but it would have to be something healthy and cheap. Any ideas on what I can do to get Hootie to gain some weight??????