Colvig continued to work with the circus in the summer. During the school year, he went to the Oregon Agricultural College, today known as Oregon State University, where he drew cartoons. In 1930, Colvig signed with Walt Disney Studios and worked on story lines. He later moved on to voice acting, performing characters like Goofy, Pluto, and dwarfs Sleepy and Grumpy.
Alan Livingston, the former president of Capital Records, created Bozo at the Circus for the children's record library in 1946. Bozo at the Circus sold over million copies, inspiring Livingston to expand the character into a television production. The show was called Bozo's Circus and aired on CBS in Los Angeles, California, in 1949. Colvig played the role of Bozo the Clown until 1956, one year before his death. Larry Harmon, an actor hired to portray Bozo the Clown at events, later bought the licensing rights to Bozo the Clown.
Colvig was also married twice in his life. In 1916, Colvig married Margaret Bourke Slavin in 1916, who died in 1950. He then married Peggy Bernice Allaire in January 1952.
Colvig died on October 3, 1967, from lung cancer. Colvig was a pioneer in advocating for warning labels about cancer risks on cigarette cartons in the United States. Nearly 40 years after his death, Colvig was inducted into the Clown Hall of Fame for his time as Bozo the Clown on May 28, 2004.