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  2. Electric fence - Wikipedia

    en.wikipedia.org/wiki/Electric_fence

    In a virtual electric fence system, each animal has a collar with a GPS unit which is set to produce first an audible warning and then a shock as the animal approaches a programmable boundary. Pet fences to control domestic dogs have been used since 1973, and the first system for livestock control was developed by Peck's Invisible Fence Co, now ...

  3. Nofence - Wikipedia

    en.wikipedia.org/wiki/Nofence

    Nofence is a Norwegian company that makes GPS collars for farm animals (cattle, sheep, and goats) that discourage them from crossing virtual fences. [1] [2] Oscar Hovde Berntsen has been working on the idea of virtual fencing, as an alternative to fixed electric fencing, since the 1990s. [3] Nofence was incorporated in 2011. [3]

  4. Pet fence - Wikipedia

    en.wikipedia.org/wiki/Pet_fence

    A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored. The system was first invented and patented by Richard Peck in 1973. [1]

  5. Keep your pet safe with this virtual fence and GPS collar

    www.aol.com/keep-pet-safe-virtual-fence...

    Teach your dog boundaries and set up virtual fences anywhere, regardless of mobile or GPS signals, to allow your dog more freedom while keeping them safe and sound. Halo also provides a 21-day ...

  6. Agricultural fencing - Wikipedia

    en.wikipedia.org/wiki/Agricultural_fencing

    The tradition of fencing out unwanted livestock prevails even today in some sparsely populated areas. For example, until the mid-20th century, most states in the American West were called "open range" ("fence out") states, in contrast to Eastern and Midwestern states which long had "fence in" laws where livestock must be confined by their owners.

  7. Cattle grid - Wikipedia

    en.wikipedia.org/wiki/Cattle_grid

    Cattle grid on country road. Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands. [5] They are an alternative to the erection of gates that would need to be opened and closed when a vehicle passes, and are common where roads cross open moorland, rangeland or common land maintained by grazing, but where segregation of ...

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