Boo Boo Bear is Yogi's sidekick appearing in the original Yogi Bear short he was usually more moral than Yogi, he makes two appearances in the show first in Here Thar Be Dwarves! in which he and Yogi try to swipe Billy's picnic basket. when he won't give it up they grow huge and menacing and stop when they enter a cave and Yogi says "We bears are terrified of caves" and Boo Boo replies "Why are we so lame Yogi?", at the end of the episode they are seen watching Billy's performance of "Buttercup Dancer", in this appearance he appears to be either high or narcaleptic and appears to be bloated and suffering from mange, he was voiced by Tom Kenny.
He made another appearance in Irwin Gets a Clue in which he is run over by Hoss Delgato's truck along with Yogi and a few other Hanna Barbera characters.