An underground dog fence is a modern and efficient way to keep your pet contained within a designated area without the need for a visible barrier. Unlike traditional fences made of wood, chain links, or vinyl, an underground dog fence consists of a buried wire that works with a receiver collar worn by your dog. When your dog approaches the boundary, the collar delivers a mild static c... https://www.amazon.com/Dog-Fence-Underground-Longevity-Continued/dp/B00ETAIE0A