All dogs have a highly developed consciousness of odor and hearing. The same smelling consciousness is used by dogs to identify the enemy and the friend.
There is a specific odor in every human being due to the difference between diet and metabolism. Dogs read these personalized odor signals and identify different individuals and can pursue the odor far enough.
Breeds like Cudd Hound, German Shepherd and Beagle are famous for their ability to follow the criminal.
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