Breed: Labrador Retriever, possibly a half-bloodhound.
Original Appearances: Hanna-Barbera's Super Friends cartoon (1973).
Other Appearances: First six issues of Super Friends comic book.
Biography: Wonder Dog is the pet of Marvin White, a superhero-in-training with the Super Friends. Apparently, Marvin views Wonder Dog as his sidekick.
Powers: Wonder Dog has the ability to bark in such a way tha the can be understood by the Super Friends. He is also able to use gestures and charades to get his point across. Wonder Dog may also be smarter than Marvin (not too difficult a task, admittedly) and Wendy!
Group Affiliation: Super Friends
Miscellaneous: Other versions of Wonder Dog have appeared in DC Comics (incorporated into the DCU in Teen Titans #62, August 2008), as well as the Justice League Unlimited episode “Ultimatum” (according to Dwayne McCuffie, anyway). Apparently there was also a “New Adventures of the Wonder Twins” TV series on Adult Swim that guest-starred Wendy, Marvin and Wonder Dog.