He's a fine little dog, just a little bit of a coward. He and Scooby share this, but instead of solving mysteries and eating a lot, Courage defeats nasty real dark forces and screams a lot; Thomas
Courage is a small pink dog living in Nowhere. He isn't brave, despite his name and would really prefer just to sleep by the fire on his owners lap. But nowhere attracts hordes of strange creatures, and Courage has to somehow drive them off to protect his owners.
Thomas met Courage when the Highbreed invaded Nowhere. Together, with Silverbolt and Optimus Primal they managed to defeat them as well as their heartless forces. He later single handedly bested Darth Julien and Space Chicken with a massive scream, that sent shockwaves across the universe, including the ones that got Tonto into the author dimmension for a while.