Dogs with a high prey drive will blow straight through it. Once they are in that mode, they expect pain. My former neighbors tried the in-ground fence with their rottie, if he was just outside relaxing it would keep him in the yard but if he was wound up it didn't work, and they were lucky no one got bit. They put up a real fence.
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“Nothing is more persistent than a liberal with a dumb idea” - Ebrand
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