Breed: German Shepherd
Original Appearances: Rex the Wonder Dog comics
Other Appearances: Sporadic DC comics apperances from 1977 to the present
Biography: Rex spent his early years in the U.S. Army's K-9 Corps, where he was used as a test subject for a super-soldier serum which enhanced his strength, speed, stamina and intelligence. He was later adopted by Major Dennis, and began his career as a crime-fighting dog. Rex was also involved in a team-up with the not-yet-formed early Justice League members. Later, Rex (along with Detective Chimp) took a drink from the Fountain of Youth, allowing them to stay young and vital for... well, maybe forever! By 1991, Rex had also developed the ability to speak, and how to use “force of mind” similar to Gorilla Grodd.
Powers: Originally, Rex simply had amplified strength, speed, stamina and intelligence. He now also possesses eternal youth, the ability to speak, and “force of mind.”
Group Affiliation: Superboy and the Ravers, Shadowpact (modern-day version)
Miscellaneous: Rex has been considerably modified since his original appearances, possibly to get him away from being a knock-off of Rin-Tin-Tin and the like. Rex was also possibly influenced on Streak the Wonder Dog, who had appeared in the Golden Age Green Lantern comic. Apparently, “Pooch” of “The Losers” is Rex's brother!