|"3rd Grade Male Dog (Number 4)" is not an official name.|
|3rd Grade Male Dog|
|Hair color||Dark Brown|
|Cartoon debut||D.W., Dancing Queen|
3rd Grade Male Dog is an unnamed third grader who made his first appearance in the opening to the episode "D.W., Dancing Queen".
He was in the imagination that Arthur had made who was daydreaming about his friends becoming teachers. It is unknown if he is an actual student that attends Lakewood Elementary School since he has not reappeared.
3rd Grade Male Dog is a dog with a brown complexion. He wears a light blue shirt with a collar and buttons, long blue pants, and brown shoes. He has brown hair.