Buster, the beloved dog from the popular television show Arthur, is a brown and white dog of the "Wagstaff" breed. However, it's important to note that the Wagstaff breed is entirely fictional and was created specifically for the Arthur series. The show, which is based on the book series by Marc Brown, features anthropomorphic animals, with Buster being one of the main characters.

Buster is known for his adventurous spirit, love of storytelling, and close friendship with Arthur, the titular aardvark. His breed, while not real, is designed to reflect his playful and imaginative personality. The creators of Arthur chose to invent a unique breed for Buster to emphasize the whimsical and creative nature of the show.

In the real world, Buster's appearance might loosely resemble a mix of breeds such as a Beagle or a Jack Russell Terrier, given his size, coloration, and energetic demeanor. However, his true "breed" remains a charming product of the Arthur universe.