Our border collie is named Gypsy because of her frequent wandering. We have an underground electric dog fence that usually works for her, because she really hates to be shocked. Apparently her collar battery went dead, because neighbors half a mile away found her, saw her AVID tag, and called to let us know the situation. Both my wife and I were at work, and thus wouldn't have missed Gypsy for many hours. Thanks to AVID, she was only "lost" for about an hour . . . again.