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2. 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]

3. 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 ]

4. Electric fence - Wikipedia

   en.wikipedia.org/wiki/Electric_fence

   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 Invisible Fence Inc., in 1987. An early application involved goats and Euphorbia esula . [ 2 ]

5. Inside America’s disturbing underground market for pets: Is ...

   www.aol.com/inside-america-disturbing...

   Prospective new pet owners are usually greeted by energetic young puppies with eagerly wagging tails and expectant lolling tongues in pet stores. Although almost every animal is presented as having...

6. Inside California's brutal underground market for puppies ...

   www.aol.com/news/inside-californias-brutal...

   A Times investigation has found that truckloads of dogs from profit-driven mass breeders pour into the state from the Midwest, feeding an underground market where they are resold by people ...

7. Remote control animal - Wikipedia

   en.wikipedia.org/wiki/Remote_control_animal

   The first is visual (white plastic flags spaced at intervals around the perimeter in the fenced-in area), the second is audible (the collar emits a sound when the animal wearing it approaches buried cable), and finally there's an electric shock to indicate they have reached the fence. [37] Other invisible fences are wireless.