When we 1st moved in to our house , a dog came running into our garage. He was real friendly and we were petting him, when all of a sudden he started screaming in pain. He had a shock collar on and it was zapping him. We immediately took it off being careful not to touch the metal things. Their was a tag with his name and phone so we called the owner and left a mssg. Locked him in the garage. The owner picked him up, put the collar back on and aid that sometimes it malfunctioned and welcome to the area. Don' know what the deal was but I've been weary of those things ever since.