Rex the Wonder Dog is a fictional superhero dog in the DC Comics universe. Created in 1952 by Robert Kanigher of Wonder Woman fame and artist Alex Toth, Rex has sometimes been compared to Superman's dog Krypto, who was created three years later. While the two canine crime fighters do share some similarities, they are decidedly different. Rex shares his name with a canine film actor "Rex the Wonder Dog", from numerous silent films of the 1920s.