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<p>the system. The pet wears a lightweight <a href="page.php?w=Dog_collar">collar</a> that emits a <a href="page.php?w=sensory_cue">sensory cue</a>, such as a warning sound, when the pet nears the boundary. If the warning is ignored and the pet crosses beyond the boundary of the fence, the pet receives an additional signal, such as a mild <a href="page.php?w=electric_shock">electric shock</a>, or a combination of signals that causes the animal to adapt its behavior and remain within the boundary.  Only animals that wear equipment that captures the</p><p>
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