All of my beagles have been neutered or spayed. I have found no cons at all to having it done. They have all lived to about 15 years old (Oliver is 14 now). They are calmer, less apt to run away, less amongst each other. I really don't see any reason to not neuter unless I had planned to breed which I don't. They were all rescues - Oliver had been neutered by his previous owner (adopted at 6 years old by us). Two were spayed at 2 years old and my first beagle Benny was neutered around 6 months old.