Pet fence
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An invisible fence normally refers to an underground wire installed around the perimeter of a home, designed to keep a pet within the boundaries of the homeowner's property. The wire carries a radio signal, while the pet wears a lightweight receiver collar, which emits a warning beep when the pet nears the boundary. If the warning is ignored and the pet crosses beyond the boundary of the fence, the pet receives a mild electric shock. Although called a "fence," these fenceless systems are actually electronic pet containment systems. In 1973, Richard Peck invented and patented an electronic way to contain pets. He called his invention "The Invisible Fence."
Since then, many companies have come and gone. The industry grew from two manufacturers, DogWatch and Invisible Fence Company (IFCO) in 1990, to thirteen manufacturers in 1993. Much of this growth came from companies that offered do-it-yourself product. Many of those companies are no longer in business. In a very short time, the industry was down to six manufacturers.
