>>Has anyone used this before? If so, how did the dog react? Is it harmful in any way?
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>>Thanks.
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Anything can cause strange behavioral side effects, but a Scat Mat is one of the least risky uses of shock with dogs. That's because it is so black-and-white, the dog can see where it is and avoid it. I wouldn't expect any positive results from it, and it is possible the dog could become aggressive or fearful about a person, place or thing that was there/happening at the moment the dog got shocked.
A portable exercise pen or baby gate--stack another above, if one is not tall enough to keep the dog out of the area--would be my choice to keep a dog out of a room and thus off the furniture in that room when I'm not there. Or I'd put a cover over the furniture and let the dog be on it when it's covered.
But if you don't want the dog on the furniture, that rule has to be 100% of the time and enforced humanely by everyone in the house. Best not to touch a dog at all when removing from furniture, because that can trigger a defensive response and you can wind up "fighting" with your dog. The dog needs a comfortable bed near the furniture, and that bed needs to be what that specific dog needs in terms of warm or cool. I would expect a Siberian Huskie to need a cool surface for resting.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47