You need to train each dog to stop before the fence. Most certainly collars have a warning buzzer as they get close.
So you set up little white flags as they near the noise zone. Then walk them up to this and warn them no. Once past this they would start to get a small shock leading onto......
They work well but you do need to take the time with the training otherwise your wasting your time money and ya dog.
Neighbour here had one with and old black lab....work brilliantly on till the poor dog went def then he would just walk up to the boundary andhe was gone once he could not hear the buzzing from the collar it was game over.
Anyway hope that helps.
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