Introduction: what's work to a dog? -- B.A.R.K.-ing in the bay -- Sheepish behavior -- Cleared for takeoff -- Sniffing for black diamonds -- The dog who didn't need to hear -- The pet trackers -- Old-fashioned detective work -- Top dog on the campus -- A nose for safety -- The pick of the litter -- Stubby the spy-catcher and other war heroes -- Athletes with E.S.P. -- Stars of the silver screen -- Toga and Gracie -- Balto's race against death -- The dog who leads two lives -- The most important gift -- Leaving prison behind -- Conclusion: the king's loyal friend.