 After William Hanna and Joe Barbera left MGM and opened their own studio in 1957, they hired Coffey to play a duck similar to Quacker in cartoons such as "Slumber Party Smarty" and "Duck in Luck" with Yogi Bear, and "Augie Doggie and Doggie Daddy", "Pixie and Dixie and Mr. Jinks" and "Loopy De Loop".However, when Hanna and Barbera turned the character into "Yakky Doodle" and gave him his own series in 1961 as part of "The Yogi Bear Show", Los Angeles children's show host Jimmy Weldon was hired for the role.Coffey finally received a screen credit for the Hanna-Barbera cartoon "This is My Ducky Day" starring Loopy De Loop, but his name was spelled Red Coffee.