The dog we have trouble with lives in the townhouse next to ours. The dog is INSIDE behind the front door and a glass sidelight. I know the Ultrasonic is not suppose to work through these obstacles but we were desperate so we gave it a try. We were amazed at the instant success. IT WORKS FANTASTIC!
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OpenBox - Dog Silencer® MAX Our first unit was defective so we returned it for a replacement. Super easy, no hassle process.
The replacement unit seems to be working just fine. Our neighbor has two of the most obnoxious barking dogs EVER! One of them now heads back to the house whenever she hears it. The other may take some extra time to train, but we've already seen improvement in his behavior.