To my knowledge of the invisable fencing operation is that the transmitter mounted in the garage uses a wire loop around the yard to transmit at a specific radio frequency and the dog wears a collar tuned to that tone setting of tone and shock. I do know the earlier version of the system would warn a dog if it got within 6 feet of the buried wire. Our dog has to be within about 8 inches to get a warning tone with the system we now have. That is a very good thing to consider if you have heart problems and a dog. I would think a person with an ICD would have to be crawling on the ground to be affected if that was possible.
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