Barkley is a full-bodied Muppet dog who appears on Sesame Street. Barkley debuted in the premiere episode of the show's 10th season, where he was initially called "Woof-Woof" and the cast voted to rename him "Barkley."
Barkley is energetic and playful, but is not anthropomorphized in the way that Rowlf and other characters are. While he may exhibit human-like emotions, he communicates only through barks, yelps, and physical contact. He was Linda's dog and understood the American Sign Language signs for "sit" and "stay." However, Barkley also had a close relationship with Big Bird.. Although Linda has since moved on from Sesame Street, Barkley has remained, presumably becoming a ward of the community as a whole. The book A Bird's Best Friend shows that Granny Birdbrought Barkley as a puppy for a present for Big Bird.
More prominently, he accompanied Big Bird on his trips to China in 1982 and Japan in 1988. He also appeared with the Muppets en masse on Night of 100 Stars. Additionally, from season 12 (1980) to season 23 (1992), the Sesame Street closing credits featured Barkley running through a park with the Kids.
Barkley's most recent appearances on the show include cameos in "Riding My Tricycle" and episode 4214, and more prominent appearances in the premiere episode of season 40, being walked (or ran) by Bob, and in a season 43 episode.
In a season 19 episode, Elmo has a new pet fish that he names Barkley.