The Ultimate Vampire Resource and Directory

As the planet Krypton is about to be destroyed, Superman's father Jor-El makes a ship and puts a white puppy named Krypto into it, planning to send Krypto up for a test flight to see if the ship is safe enough for interstellar travel. While aboard the ship, Krypto inadvertently presses a few buttons, causing the ship to put him into a deep sleep while the ship heads on to Earth.

Upon landing on Earth, Krypto finds he's a full grown dog, possessed of superpowers similar to those of Superman's (since all Kryptonian life-forms gain superpowers from exposure to a yellow sun, such as Earth's sun). Later, Krypto is adopted by Kevin Whitney, a young boy, who Superman arranges for Krypto to stay with. Krypto poses as an ordinary dog while living with Kevin's family, but adopts the secret identity of "Superdog" for his super heroic deeds; Kevin is aware of Krypto's dual identity.

In this series, the various animals, including Krypto, all are capable of speaking to each other, but not to humans, save for Kevin (who is able to communicate with Krypto and the other animals thanks to a universal translator Kevin wears) and, of course, the viewers.