I was VERY suprised by my girl. She is a quite large Alaskan Malamute and LOVES everyone. The other day, my husbands cousin came to pick up a trailer. He didn't tell us or knock , he just started hooking it up. She went crazy barking and jumping around. Even when I called out that it was fine, she barked non stop at his offsider , who was trying to talk to her!! Maybe she knew something we didn't!!!