My Rednosed Pit is scheduled to be neutered tommorrow morning. He is 61/2 months old and weighs about 65 lbs. He is an absolute freak. He commands a 5 mile run/walk everyday. He eats about 20lbs of dog food every ten days and this does not include the extras. I am worried that he will gain weight even more rapidly after the surgery. He is so lovable right now and loyal. He listens well and it just doesn't have it in him to be mean. Will having this procedure effect his nice demeanor as well as his weight? Thanks so much for your insight in advance.