My neighbors have a very old german shepard that looks like he has mange. He has just recently gone bald over his whole hind quarters area. I know what irritated skin due to allergies looks like, but this dog looks like the mange riddled dogs you would see on an animal cops show. My dogs have a fenced in yard they are confined to when they are outside. But my neighbors dog has free run of the neighborhood. If it is mange I don't want my boys to get it. How would be the best way to talk to them without coming across in a bad way?