I had a large dog and the invisible fencing really worked well most of the time. The only time it would fail was when a motorcycle went by my house. The dog would take off like a "bat out of %^&*" and go right thru the invisible fence. Then the problem was when he realized he could not catch the motocycle, he would return home only to find he could not get back on the property because of the invisible fence. Once my neighbor let him out and he took off after a cycle and because the neighbor did not know how to shut the fence off, she had to drive her car off the property, put the dog in the back seat and then drive back.
As a whole though, they really do work quite well. They r just not motorcycle proof.
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