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We have one. Works great. After the dogs were used to it they stopped even needing the collar. They run up to the line and just hang in the yard watching the kids go by. And cars, and trucks. They learned the door revolves around them now. We put one in ourselves and then replaced it with the "invisible fence" brand. Their collars work better and their wiring is hardier. The homeowner installed brand didnt last a couple years before it had issues.
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