Role in the series. Buster is a curious and inquisitive dog who likes to yap loudly when he is either excited or on the scent of something. Buster is not of any recognized breed of dog and is likely a mutt. Buster is part of the problem-solving group known as the Super Sleuths along with Darby, Pooh and Tigger. Though oftentimes he seems to be only tagging along, his nose and his curiosity have proven an asset in many of the groups' cases.