Steve is a total athlete, i think he was one in his past life lol, the only difference with Karl and Steve is Karl has more loose skin so i dont think he will get that ripped look like Steve-o has lol but Karl is about 2-3 inches taller then him. Karl had pano as a pup so he may have gotten taller because of that, the long bones , from what i have read on pano, make the bones grow longer maybe its because of the extra calcium deposit inside the bone , i dont know lol. I would have to say Karl is about 30-31 inches at the shoulder, Steve is about 27-28.