Hi, I am having trouble putting weight on our 2nd rescue Boxer. He is roughly 1 1/2 year old & very active. I had him on Eukanuba puppy, no luck gaining weight. I have since switched to Blue Buffalo & he is still very thin. I brought him to the vet & his bloodwork came back normal. I wanted to rule out Diabetes. He weighs 55 lbs & eats twice the amount of our 75 lbs boxer (on purpose of course). He is happy and otherwise normal, just on the thin side. Any suggestions would be greatly appreciated. I do give him plenty of treats as well. Thank you kindly!!