They work for some dogs but not for others. I used one on my dog, she hated it and rebelled. My neibor used one and her dog behaved very well. My other neibor used a invisible fence and now the dog tries to attack people on the street because he connected the people with the shocks when he was just comeing to say hi. Some dogs react differently to the shock collars, sort of like some react differently to choke chains.
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