Tony is right. Our dog was trained to know where the boundaries are and she won't go near them. She doesn't know if the power is on or not, if the collar battery is dead or not, or if the system is unplugged (My husband likes to use that outlet for some reason and often fails to re-plug the invisible fence). I'm sure there is a slight possibility that a dog could get out, but again, at what point do we stop with the "what if's"?
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