We can also run a 3 sided or open loop fence system. We do systems on lake front property and use an open loop system to allow the dog in the water or get to a boat docks. We even have the option of closing off the loop in the winter, so you don't have to worry about your dog falling through the ice. A three sided system is also used when a conventional fence system is in one part of the yard, and we provide underground fence for the rest of the yard. NOTE: Hidden Pet Fence in Rochester, NY is NOT affiliated with the Invisible Fence® Brand OR PetSafe® brand. We do however offer replacement batteries, service, dog training and parts for those brands. We are NOT authorized dealers for those companies. Radio Fence® and Underground Fence® are Trademarks of Radio Systems Corporation. PetSafe® is the registered Trademark of Radio Systems® Corporation Invisible Fence® is a registered trademark of Invisible Fence Inc.