Extreme Dinosaurs is an American animated series produced by DIC Productions, L.P. in 1997 based on a 1996 toy line from Mattel. This show is a spin-off of Street Sharks (where they first appeared as the Dino Vengers).
The show had only one season with 52 episodes that aired between September 1, 1997 and December 24 of the same year. In Brazil (where the show is known as Dinossauros Radicais), the series aired on the Cartoon Network between 1998 and 1999, having its last rerun in 2003 in the channel Rede Record, never coming back on any other channel or streaming service.
Just like Street Sharks (whose existence of the Brazilian dub is unknown), Extreme Dinosaurs is considered another one of several 80s and 90s DIC Entertainment shows that has it's dub lost in Brazil. The only exception of a episode found is the episode 24: Day of the Condorsaurus, which has been available on Youtube since 2016.