I keep going back and forth on whether or not I think Bella is too thin. She hasn't gained any weight since she was about 12 months old. (She'll be 17 months old on Wednesday.) I can feel her ribs without putting any pressure on her middle, and I can see a lot of her spine when she's curled up in a ball. I can see some of vertebrae when she's sitting or stretching, but not when she is standing normally. I don't know if she's just lean or if she's too skinny. I just want her to be as healthy as possible. What do you think? Feed her more, or keep doing what I'm doing with her? She weighs 63lbs., and she gets 3 - 3.25 cups of Timberwolf Organics plus some treats every day.