Can’t swear to this, having never owned one, but I *think* they now have e-fences that actually zap the dog well within the perimeter, a fair distance from the actual fence.
They may have created it for people who have sight hounds and live where they can’t have fences.
Seems to me somebody on the Ibizan forum mentioned it a while back.
A 300 pound man is not going to be able to stop Fur Shur.