Cover-date November 1961 brought us two stories in which Superman might have met his end, leaving us to wonder what his pet dog would do without a master. In the first, "The Death of Superman!" presents an imaginary story in which Luthor repents, cures cancer and starts helping Superman. Feeling betrayed, Metropolis' criminal underworld vows to kill Luthor unless he kills Superman. But though Superman saves his life a number of times, they really didn't have to force him to do the dirty deed. It was his plan all along, and was juts lulling Superman into a false sense of security until he could spring a kryptonite trap on him. Superman dies. Krypto is sad.
Look, it worked, what more do you want? And regardless of what you think of Lois' cleverness, Superman's survival was all thanks to Krypto.