One of Hanna-Barbera's first hit characters was the blue hound named Huckleberry. (although he almost wasn't named Huckleberry due to the fact that some thought it would be too hard a name for kids to remember). Huckleberry became famous not only for his southern drawl but also for his very laid back and carefree attitude. As, was the title of one of his main appearances on the show, Yo Yogi! he was a 'mellow fellow'.
There seems to be some debate and confusion on the web as to who exactly voiced Huck on the Fender Bender 500 segment of the show, Wake, Rattle & Roll, but recently Mark Schiff deconfirmed his involvement in the show, leaving Greg Burson to be the voice for the hound. This show was the only time Huck has not been voiced by either Daws Butler or Greg Berg.