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  2. Invisible Fence Inc. - Wikipedia

    en.wikipedia.org/wiki/Invisible_Fence_Inc.

    Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]

  3. 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]

  4. Collar (animal) - Wikipedia

    en.wikipedia.org/wiki/Collar_(animal)

    These collars administer an electric shock to the animal in training, in order to reinforce commands and eliminate any bad habits. It may be combined with an "invisible fence," a signal wire surrounding the dog's permitted area. The dog receives a shock if it strays too near the perimeter.

  5. 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]

  6. Martingale (collar) - Wikipedia

    en.wikipedia.org/wiki/Martingale_(collar)

    Martingale dog collars are also known as greyhound, whippet or humane choke collars. The martingale dog collar was designed for sighthounds because their necks are larger than their heads and they can often slip out of buckle collars. These collars have gained popularity among owners of other breeds in the recent past with many trainers now ...

  7. Dog collar - Wikipedia

    en.wikipedia.org/wiki/Dog_collar

    A dog collar is a piece of material put around the neck of a dog. A collar may be used for restraint, identification, fashion, protection, or training (although some aversive training collars are illegal in many countries [1] [2]). Identification tags and medical information are often placed on dog collars. [3]

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