Jaqueline: From the pics in your gallery, Miss Murphy looks like a typically lean boxer puppy to me, and it's really not something I'd be concerned with. That's very normal for a boxer puppy, and feeding more will simply make her grow taller faster. Chances are, she'll be lean until around 18 months and then she'll slowly start to fill out. As long as you're feeding a good quality food (which you are), I really wouldn't worry. LOL - I've seen a LOT of boxer puppies that are very much thinner than your girl.