The puppies jostled for position, gnawing on one another's tails and rolling in the grass of the outdoor pen. The two Los Angeles policemen watched them with the cool calculation they might give suspects in a crime lineup. Officer Jeff Miller dangled a ball on a string to see if one of the seven dogs would bite — chase a would-be prey and pass the test. "The white female," he said to his partner, Sgt. Doug Roller, without taking his gaze from the animal. "That one likes the ball." The K-9 officers had come to Asia in search of a...