Jim Henson as Rowlf The Dog

Built in 1962 for for the Purina Dog Chow commercials, Jim Henson Don Sahlin created and built Rowlf, I remember Rowlf on the Jimmy Dean Show and he became famous from that show as Jimmy sidekick, he was on every episode from 1963-6, his fan mail was in the 1000's each week

As many of you might think to the contrary Rowlf was only on a few Sesame Street shows, but was a regular on the Muppet Show in 1976, as the pianist in the opening segment. Rowlf also played Dr. Bob, the wisecracking doctor in a recurring medical drama skit "Veterinarians' Hospital", alongside nurses Janice and Miss Piggy In 1984, Baby Rowlf debuted playing a toy piano during a musical number in The Muppets Take Manhattan. This fantasy sequence with the Muppets as babies was so popular that it resulted in the successful animated cartoon spinoff, Muppet Babies. He was voiced on that program by Katie Leigh.
Jim Henson's last public performance as Rowlf before his death was as guest on The Arsenio Hall Show in 1990. For several years afterward, the character was retired out of deference to Henson's memory.
transitioned into the role. Rowlf uttered his first word since Henson's death in the second episode of Muppets tonight Rowlf had several lines of dialogue in The Muppet Show Live in 2001 and also spoke two lines of dialogue ("Hey, Kermit!" and "Yeah! Heh, heh. Oh!") in It's a Very Merry Muppet Christmas Movie in 2002. In 2005, however, Rowlf had a 190-word monologue in the second episode of Statler and Waldorf scene.