Gold Key · April, 1963
1st Appearance of Duke (german shepherd police dog); 1st Appearance of Sgt. Danny Nolan; Indicia lists title as“Duke, of the K-0 Patrol”; One-shot
Duke of the K-9 Patrol; Breakdown; Dogs Versus Crime; Friends of Man (text); The Masqueraders; Six Keys to a Well-Trained Dog
Artist: Dan Spiegle