When I lived in Maryland on a farm, there was a telephone pole about 300 ft. from the house. One morning I heard deep barking and barking. I looked outside, and there was a giant Great Dane standing by the telephone pole, barking. I called him and he wouldn't move. Looking around and Up, I realized that he had an electric collar on, and when he tried to move,the above wires would shock him! I went and got a long pole(wood) and shoved him out from under the wires, and he came to me. Turned out his owners were away and neighbor was watching the dogs. Elec was off for awhile, and dogs left the boundry. I eventually found out who was "watching" them, and someone else, found the other dog. Personally, I would never go away and leave the dogs,and certainly not outside. Poor Dane wad getting a BIG shock from the overhead wires!!!