Arthur: The Red Dog, okay? Got it?!
In "D.W.'s Library Card," Arthur reads, word by word, the title of this book to D.W. The book is likely a spoof on Clifford the Big Red Dog, a book by Norman Bridwell, which spawned a popular series. It was later made into a PBSKids Television program. However, the series had not yet premiered at the time of the original release of this episode.