He is probably best known as the voice ofΒ Disney's GoofyΒ and the originalΒ Bozo the Clown,Β a part he played for a full decade beginning in 1946.Β He also provided the voice for Practical Pig, the pig who built the "house of bricks" in the Disney short Three Little Pigs, as well as both Sleepy and Grumpy inΒ Snow White and the Seven Dwarfs, and the barks forΒ PlutoΒ the dog. Colvig worked for not only the Disney studio, but also theΒ Warner Bros. animation studio , Fleischer Studios (Bluto, Gabby), and MGM, where he voiced a Munchkin inΒ The Wizard of Oz.