Had a beagle who loved to roam tail a-wagging. Got the invisible fence and trained the dog. She learned that there was a big shock coming if she got near the boundary, and she would slink to the line, whimpering, ears down and you could see her get the jolt, then she was happily beyond the wire and away. It was worth the shock, fully turned up, to get out and go visit the nearby elementary school to play. Smart dog. Fence failure.
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