I have seen this before at Bobby Rahall's House.
It was pretty funny, every time the phones rang the dogs would do flips!!
What had happened is they buried the electric fence right over the under ground drop coming to the house and the inductance was causing this to happen.
I would have telco come out and mark where the lines are underground.
Then you should be able to find out if the dog fence was put in on top or next to it.
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