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Rex the Wonder Dog, less commonly known as Wondrous Rex, is a fictional dog in the DC Comics...

Rex the Wonder Dog, less commonly known as Wondrous Rex, is a fictional dog in the DC Comics universe created in 1952, though he was based on the character Streak the Wonder Dog who became Green Lantern's dog sidekick in 1941 and eventually replace the superhero as the cover star of his own magazine. Rex starred in his own bi-monthly series, The Adventures of Rex the Wonder Dog for eight years. It was written by Robert Kanigher of Wonder Woman fame and was illustrated by Alex Toth, who later went on to create Hanna-Barbera's Space Ghost. Rex has sometimes been compared to Superman's dog Krypto, who was created three years after, and though the two canine crime fighters do share similarities, they are decidedly different. Rex also shares the same name with a number of other fictional dogs, including Rex the Runt, Inspector Rex and Rex the Wonder Dog, a canine actor from numerous silent films of the 1920s. Rex is a white German shepherd who spent his early years in the U.S. Army's K-9 Corps, alongside his brother, Pooch. Even early in his training it was apparent that Rex had great potential, which resulted in Dr. Anabolus selecting him as a test subject for a super-soldier serum.