A
Actually, I almost typed "you can even use it on yourself first", but I didn't want the post to be too long. I've seen people use the shock collars on themselves. Maybe the kind you had was a much stronger one, or your body is less tolerant of electrical pain than most. Either way, I still think it's better to train the dog than to possibly get rid of him, risk more hamsters, or keep the property chicken-free .
Some people have a high tolerance for pain. I've got none. lol