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Actually it works on several things. First and for most, the dog will go after the guy that runs...
If you ever get the chance to watch, the dog handler will notify the other cops in the area by yelling or radio, depending on perimeter size that the dog is loose.. All the cops will stop moving. That way the dog is not confused, and will get the guy that is running.
They will not normally let the dog loose in an area where there may be other people...
They dogs can also smell the fear..
Some of the dogs, can tell the dif between street clothes and the uniform of the officers.
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