Rowlf the Dog

Rowlf the Dog (performed by Jim Henson, currently by Bill Barretta) is a Muppet character who plays the piano, and

performs as Dr. Bob in Veterinarian's Hospital. He first appears in Jaden's Adventures of the Muppet Movie, where he gives Kermit the Frog his motto in life, a motto even he can't follow - "stay away from women." He later joins Kermit, Jaden and his team on their way to get to Hollywood and become famous.

Trivia

 * Rowlf will appear again in Jaden and The Muppets (2011).