Quick Answer: Krypto, also known as Krypto the Superdog, is a superhero dog appearing in American comic books published by DC Comics, commonly in association with the character Superman. In most continuities, Krypto is Superman's pet dog, usually depicted as a white dog of a generic pedigree. Krypto has appeared in numerous television series and films, such as the animated series Krypto the Superdog; the television series Smallville, the live-action HBO Max series Titans, the animated film DC League of Super-Pets voiced by Dwayne Johnson, and the fourth season and series finale of Superman & Lois. The character made his live-action cinematic debut in the DC Universe film Superman, and returned in the DCU film Supergirl.