Dave Immure

I have a 4 month old GSD that will not keep on the weight. I feed Honest Kitchen (Embark) for now and plan to move to raw as soon as I finish a book I ordered off of Leerburg's site. I had a fecal sample analyzed and everything came back negative. Activity levels are normal and he has a good appetite. I am feeding four cups a day which is the max recommended for a 30-50lb dog on the box. I also give him tons of training treats throughout the day. Does anyone have any suggestions? He is 32lbs and showing to much rib for my liking.