The Pond Protector protects the pond fish against hungry herons and cats. A very effective way of keeping unwanted animals away from the pond is to install this electric fence. The energizer sends electrical pulses to the wire around the pond. When they touch it, animals feel a shock, which triggers an immediate flight response. The instinctive behavior of herons and cats is to stay away from the fence in the future. Fish will be safe in the pond again.