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Rowlf the Dog, surprise, surprise, was first made in 1962 for a series of Purina Dog Chow commercials. He went on to claim fame as Jimmy Dean's sidekick on The Jimmy Dean Show and was on every single episode from 1963 to 1966. Jimmy Dean said Rowlf got about 2,000 letters from fans every week. He was considered for Sesame Street but ended up becoming a regular on "The Muppet Show" in 1976.