Seven and Zelda are bomb-sniffing dogs trained to detect explosives on human beings and track contraband-laden bad guys on the move at Albany International Airport in New York. In most cases, dogs sniff out explosives in stationary objects, so this is a new tactic to foil would-be terrorists. "It's unobtrusive -- the dogs are very, very effective. Their senses are tremendous," said Albany International Airport CEO John O'Donnell.

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