A fairly light police drama but not a shaggy dog story. After PC Frank Mason's (Tim Turner) partner is shot by a burglar spiv (Cecil Brock), Frank decides to become a police dog handler. Frank is given Rex to train up and look after. Frank takes Rex home but this soon causes tension and jealousy between Frank and his girlfriend Pat (Joan Rice). Frank meanwhile is also keen to find the gunman...
There is nothing too surprising here, it has the usual depictions of British life in the 1950s, everyone humble but cheerful. The dog training scenes are interesting though and Rex plays a good role (an actual retired police dog).
Christopher Lee and John Le Mesurier have cameos as fellow police officers to Frank, Lee being unkeen on dogs and getting bit!