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.
- Jaden will meet Rowlf again in Jaden's Adventures of The Great Muppet Caper.
- Rowlf will appear again in Jaden and The Muppets (2011).
- Rowlf will make a cameo in Jeffrey & Friends' Storm Adventures of The Muppet Christmas Carol. He'll also appear in Jeffrey & Friends' Storm Adventures of The Muppets (2011).
- Jeffrey and Jaden will meet Rowlf again in Jeffrey, Jaden & Friends' Storm Adventures of Muppets Most Wanted.
- Rowlf will appear again in Jeffrey, Jaden, Hiccup & Juniper Lee's Storm Adventures of A Muppet Family Christmas.