Dogtra GPS FenceDogtra GPS Fence is a wireless containment system that uses GPS to create a virtual boundary for your dog. No buried wire needed. Set your boundary on the app and the GPS collar keeps your dog within the virtual fence. GPS based virtual fence, no buried wire Set boundaries via smartphone app Portable, works anywhere Rechargeable collar Adjustable stimulation and warning zones Take your fence with you. The GPS Fence works at home, the cabin, the