Gary,
I replaced 4 collars from them tearing them up...I did everything, I could to keep them from eating the collars...Finally, I gave up and went up to the hardware store...got some Electric fence wire, fence hooks, Hotwire box all for less than $50 came home set it up and have not had a problem with them since...and you can turn it off and on by unplugging it...I wish, I would have did this in the beginning instead of spending all this money on the invisible fence.... My dogs touched the hotwire once...and have never touched it since...
Amber
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