We used one several years ago, when one of our dogs kept getting out.(It was more amusing than anything else, because he would proceed to one of two neighbors yards, dig/slide/etc under their fence to get INTO their yard, all just to visit their dogs.) It worked perfectly, and we never had any other issues with them getting out. However, I would be very nervous about using it exclusively without a fence as well if you plan on leaving the dog unsupervised. They aren't fool-proof, and they also don't prevent other dogs, kids, or whatever from coming into your yard. Depending on how your dog would react, it might not be a good approach in that situation. We used the actual Invisible Fence, professionally installed.
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