I have always wondered about this too. It seems like the consensus is that a bigger head does not equate to better performance or a harder bite. Some old timers say that a dog bites hard because he/she wants too, regardless of head size or shape, idk. In regards to efficiency and cooling, could a bigger head, mouth, tongue, nose help??? By the way NQK, have a young male out of your Roxie bitch and he has a little longer snout. I think he is the bees knees. He is littermate to Cody's Gator boy.