Dog In-Ground Fence is an effective solution for containing large or stubborn dogs within your yard. This underground fence system provides a customizable boundary that can cover up to 1/3 acre, expandable with additional wire. The collar delivers a safe but firm static correction to deter dogs from crossing the boundary. The it to your dog's temperament. It's a reliable and durable option for pet owners seeking a long-term containment solution. https://www.amazon.com/stores/ExtremeDogFence/Homepage/page/C5124D62-2991-4D1B-845C-C1AE331F45FD