My dog goodboy was very protective of both my husband and me. If friends came to visit he would watch them and mumble under his breath, he made funny noises, to let them know not to pull any funny business. However, people we were leary of, he licked their hands and really liked them.
One day some children came to the door selling candy and rang the door bell. Goodboy, ran to the door and leap up against it barking and scaring those little ones to death. By the time I got him away from the door and looked out they were running down the street as fast as they could go. No one came selling anything at our house again. lol
