Muffy's dog

Muffy's dog is an unnamed, unseen pet that was referenced once in the series, by Muffy in D.W., the Picky Eater.

Information
Muffy, Arthur, Francine, and Buster are talking in the halls of Lakewood Elementary School. Arthur has no ideas left on how they will get D.W. to try something new (like spinach) to eat at Once Upon a Restaurant. Muffy suggests something:

"D.W. just has to see somebody she admires eating spinach. Trust me, that's how our butler got our dog to try a new brand of dog food."