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We have a German Shepherd and a mixed breed and an invisible fence. It worked really well for about a year and then they started ignoring it. For the shepherd we got another collar for hard to train dog that seems to be doing the trick. It vibrates in addition to the shock. One of my main concerns is my dogs chewing up our neighbors stuff. The mixed breed has grown out of that stage but the shepherd is a chewing machine.
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Michael
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