Hey, me too! He runs off a dang Jehovah's Witness about once a month!
Yes, she works great for JW's. I just open the inside door and leave the full view storm door closed. I let her bark at my side while they say a few words and leave. She tends to go a little crazy when someone's at the door. Better than an alarm system except that she can't call the police if I'm not there. <g>