June 1959 marked the first time Krypto would appear TWICE in the same month - once in Adventure Comics, and once more in Superboy. Just a brief sequence in the former, so let's start with the latter: "The Dog-Catcher of Smallville!" And the eponymous dog-catcher is Burt Bentley, the villain of the piece, who shows why working for commission is the devil's playground.
Also in June 1959: Adventure Comics (1938) #261
During Superboy's first encounter with a young Lois Lane, he keeps his secret identity intact by getting Krypto to save her and Lana Lang from a cave-in.