A neutered dog is usually a calmer dog and tends not to get overly protective. He is not dealing with hormones that cause him to want to find a female. My son did not want to get his Lab neutered. It seems some human males have a real aversion to neutering their male dogs.
But his dog was continually finding a way to get out of their fenced backyard to go running around the neighborhood. Finally he got him neutered and after several months the escape act stopped. It takes a while for the hormonal change to kick in on a more mature dog. Some un-neutered dogs get overly fond of marking their territory. You can avoid a lot of problems by just neutering the dog and letting him live a normal doggy life. It's a less invasive procedure for a male dog and they recover very quickly.