My parents got me a collie-shepard mix pup when I was about six, back when door to door salesmen were common. That dog lived to be 18 and was about as mild of a mutt as you could hope for except for an unknown salesguy who stopped by just once. Good thing for a stout screen door or the guy probably would have sued my folks after getting mauled. Mom was home alone and was the one to answer the knock, she had no doubt there must have been something off about him and was glad he didn't stick around.
