Our boy Joey will be three years old next month. He is right around 70 lbs. I know this sounds good, but he looks skinny. He eats well, Eukanuba large breed, twice a day. His ribs don't stick out or anything, but he is just very narrow thru the hind end. When do males start "filling out"? He gets plenty of exercise and plenty of rest (he sleeps right on top of you if you are on the couch trying to watch tv!) We just thought he would be putting some meat on his bones by now!