Muttley first appeared in Hanna-Barbera's Wacky Races in 1968 as Dick Dastardly's snickering dog sidekick, voiced by Don Messick without real dialogue. His raspy laugh carried over to Dastardly and Muttley in Their Flying Machines in 1969 and became one of the most reused cartoon laughs, alongside the Woody Woodpecker Laugh. In Brazil the clip circulates widely as Risada do Muttley on WhatsApp and meme pages, where its wheeze signals mockery, schadenfreude and a plan gone wrong without any explanation needed.