I lived on a farm and it all electric fencing.
It fine and work grand with my horse.
I dont know how she knew to keep away from the wire fence maybe she can sense or feel the electric current and so keep her distance.
Her colt is learning her behaviour and when they galloped around the field they stay away from the fence.
But sometime she would stop suddenly from a gallop to a sliding halt near the fence, I think she get a kick of thrill doing that.
mad mare!
Yesterday she was standing too close to the fence while i was grooming her and I push her away from the wire.
Today my little cousin he's 5, visited today with his father and their dog. he was standing watching the horses and suddenly grab hold the wire.
I yelled to stop that he will get electric shock.
He just grinned at me and shook the wire.
It was off so my mare knew that yesterday and I didnt have a clue whether it was on or off.