There was a really cute little black maltese mix that used to hang around my house when girls were in heat. i took him home several times, called animal control, put him in "jail" and the owner would just bail him out and turn him loose again. he was a very determined breeder and although he never got to one of my dogs, he was very persistent at the gate to the back yard. I got sick of it and finally just made an appointment and had him neutered, turned him back loose a day later. Never saw him here again.