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The many dog's in and around my area start to ' howl / sing ' together .. then a few minutes later . . .off in the distance I then ' hear ' an Ambulance / Cop Car Siren ..... they hear it before I do.
Dog's also have a ' smelling sense ' 100,000 times more sensitive than Man.... ( Documentary on Dogs .. A Mans Best Friend )
That's why they are used in Snow Rescue / Drug Detection / even Medical fields.
Col
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