Stephen McAllister was a grunt, a dog handler in Vietnam, tasked not only with fighting what was by then an unwinnable war but with rehabilitating a scout dog named Big Mike whose trauma ran even deeper than his own. McAllister's voice has an abundance of heart and humor, but the laughter has a catch in its throat. For all the ingenuity and camaraderie, a dark and suspenseful melody plays behind the adventures of McAllister and his unforgettable...