An invisible pet fence can be installed in a few hours as a do-it-yourself project to establish a permanent boundary area for your dog. Wire buried just inches below the ground transmits a radio signal to the special collar your dog wears. An underground dog fence can cover up to 100 acres and are highly customizable to the size and shape of your property. Some in ground fences can be extended to also create wireless indoor barriers to keep your dog out of specific rooms or areas of your house.