He began performing as a voice actor in films in the 1930s He was the voice of Cheetah in Tarzan films and produced the bird sounds in Disneys Snow White and the Seven Dwarfs 1937 Pullens vocal contributions appear in many cartoons featuring Mickey Mouse Betty Boop and Popeye Pullen was also the voice of the howling coyote in Cecil B DeMilles The Crusaders and the squawks and jungle sounds for Martin Dennys Quiet Village In 1945 Pullen began a collaboration with Spike Jones providing sound effects and other comic gimmicks on many of the classic Jones recordings Jones gave Pullen the stage name Dr Horatio Q Birdbath Pullen was the voice of Pierre the Parrot in Walt Disneys Enchanted Tiki Room at Disneyland and Disneyworld He was also heard in the San Francisco Bay Area as the voice of Roscoe the Dog on the Dr Don Rose show on KFRC Pullen also appeared in nightclubs as a ventriloquist with a dummy named Johnny Pullen was a longtime resident of Vacaville California where he performed puppet shows at the Nut Tree in the 1970s and 1980s and where he appeared with Roscoe the Dog a supposedly invisible dog puppeted by means of a stiffened dog leash