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working dogs >> what we look for in the puppies is the drive to move towards things that move, bite them and possess them. >> reporter: or something as simple as a water bottle teaching pups to work through distraction before getting a bite of a hot dog. the stars shepherds and the belgium dog intelligent and athletic labs trained to sniff explosives and narcotics and for the navy, jack russelld sense of smell art for tight spots. >> it's like a natural instinct. they have a sense. they know what something is going down. >> reporter: after proving they can bite, tackle and track almost anything, the toughest part for trainers, saying good-bye. >> these dogs are irreplaceable. they come with the capability that no human has. >> reporter: a battle tested best friend ready to play hero no matter what morgan chesky, nbc news. >> we thank them for their