What does your dog do when he sees unknown people? Does your dog bark or wag his tail when he sees unknown people? When does your dog usually bark at unknown people? Why does your dog always bark at unknown people? Who does your dog bark at when he sees unknown people? Is it only unknown people that your dog barks at? What other behaviors does your dog exhibit towards unknown people besides barking? How does your dog react when unknown people approach him? Why do you think your dog barks at unknown people? What training methods have you tried to stop your dog from barking at unknown people?