From my experience, neutering doesn't really effect a dog. My two pups were both neutered at about 5 months old, and the day after surgery their still crazy boxer pups as usual. Even wearing their "E" collars they kept romping and roaring around. We ended up buying 7 "E" collars cause they kept crashing into each other and cracking the ones they had on. And at 17 bucks a piece it got annoying after a while and I just started duct taping their collars when they would crack. Lol. I'm sure the neighbors got a kick out of seeing 2 boxer pups with "lamp shades" on covered in strips of duct tape! Anyways, back on subject, I don't think neutering calms them down really. I'm sure it help with stopping the urge to roam, breed, or mark territory though.