Electric fencing provides a successful boundary by shocking an animal when there is contact between the animal and the fence wire. For electric fencing to work properly, current or electricity from the fence must travel through the animal, into the ground, and back to the energizer. The grounding on the energizer works as an "antenna" to collect the current and complete the circuit, which allows the animal to feel the shock. Frustration with electric fencing occurs when animals do not receive a proper shock when they first come in contact with the fence.