A solo adventure for Krypto begins when he eavesdrops on Clark Kent's science class and learns that Sirius is called the "Dog Star". And off we go to a handy wormhole!
Meanwhile, in Action Comics #325... Superman recalls one of his adventures as a baby on Krypton, when Jor-El accidentally zapped him with an enlarging ray that turned him into a rampaging kaiju baby. Who's fault was it? Puppy Krypto's:
Also around the time of these publications, Krypto stories were reprinted in 80-Page Giants, specifically in #10's Superboy All-Menace Issue, #11's The Greatest Superman-Luthor Duels, and #13'a Jimmy Olsen issue.