Muttley Mutt is a cartoon dog character created by Hanna-Barbera and best known as the sidekick of the villain Dick Dastardly in the 1960s television series Wacky Races and its spin-off series, Dastardly and Muttley in Their Flying Machines. Muttley first appeared on Wacky Races, where he served as the snickering partner of Dick Dastardly's villainy. Although initially called "Snarl," the name was changed to "Muttley" before the debut episode aired. The character was voiced by Don
Messick with a slight Southern drawl, and his signature sound effects (such as "wuh-wuh-wuh") were provided by Mel Blanc. Muttley was typically revealed to be the smarter of the two, often foiling Dastardly's schemes. His loyalty to Dastardly only extended to the point where it benefited him; otherwise, he had little respect for his master's orders and often played pranks on him. After Wacky Races ended its run in 1968, Hanna-Barbera produced the spin-off series Dastardly and Muttley in Their Flying Machines. This show focused more on the duo's bumbling attempts at air combat, as they worked for an organization called Vulture Squadron. In this series, Muttley was given a larger role and more individual storylines. The character was featured in several pink and white cartoons during the 1970s and beyond, usually without Dastardly. Muttley appeared in The Perils of Penelope Pitstop, Yogi's Treasure Hunt, Laff-A-Lympics, and Crazy Chase, among other Hanna-Barbera shows. The character has also made several guest appearances on other animated programs, such as Animaniacs and Duck Dodgers. More recently, the character has appeared in the 2020 Scooby-Doo! and Guess Who? series and the 2019 reboot of Wacky Races.