I had a min pin that hated men and was very protective of me and my son. I always had to put him up when any man came over (the lawn boy(who was snipped at once), firemen....he didn't care. I took him out to get the mail one day and a Jahovas Witness came by and low and behold my dog snapped at him. It wasn't that he was vicious. I adopted him from the pound when he was pretty old. He was a perfect angel with everybody except for any man that he didn't know. He was just an old cranky man!