Our dogged detectives sniff for clues in five canine-related old time radio mysteries. First, the owner of the best in show pooches is killed at a dog show in a syndicated adventure of Boston Blackie, and a dog "tells" Sherlock Holmes who murdered his owner in "The Case of the Dog Who Changed His Mind" (originally aired on Mutual on September 28, 1947). Philip Marlowe is on the trail of a dog - though this one is made out of jade - in "The Orange Dog" (originally aired on CBS on January 22, 1949). Barry Sullivan plays The Saint in "Dossier on a Doggone Dog," a story of a lost dog and stolen jewels (originally aired on NBC on September 24, 1950), and Barrie Craig is hired to walk a dog, only to discover the dog's owner knocked unconscious in "Beware the Walking Dog" (originally aired on NBC on May 3, 1953).