[new-yorkie]

I went to visit my Tabitha today. She has been living with my cousin for the past year. When I held her I was able to feel her spine and ribs. Its starting to scare me. She eats Solid Gold Wee Bits. My cousin told me that Tabitha eats very little but when she's given a treat, she would gobble it in 2 seconds! Should I buy her another brand of dog food? I'm always looking for very low-fat food and treats but I don't know if I need to give her more fattening foods. Thanks for your help.