Adventure Comics #269

When Superboy reprimands Krypto for playing super-pranks, the Dog of Steel goes into space and finds a new super-powered master in Solar Boy, who turns out to be a sadistic tormentor of the dog, depriving Krypto of his powers through the same solar ray machine that empowers him. However, Krypto is able to trick one of Solar Boy’s robot housekeepers into damaging the machine so that his powers are restored, and then thoroughly demolishes the machine before returning to Earth, having learned a valuable lesson about how lucky he is to have a compassionate master.