Brian (4th grader)

4th Grade Male Dog is an unnamed character who debuted in the episode Arthur's Eyes. This character has never spoken before and his personality is unknown, but he is generally friendly to the other kids including younger kids. He hangs out with both third graders and fourth graders though is most of the time seen with Otis and the relationship between him and Otis is unknown at this time, though they could be close friends.

Appearance
He is a dog with a cream complexion wearing a white shirt with long sleeves, long green jeans, and blue and white sneakers. In the episodes D.W. All Wet and D.W.'s Backpack Mishap he wore green swimming trunks. In the summer he wears a white shirt and green shorts. He also wears a green jacket for the Fall and Winter.

Trivia

 * This character's notable appearance was D.W., Bossy Boots and Dancing Fools.
 * There is a possible chance that Mary Ann and Unknown Male Dog maybe his younger siblings.
 * He is seen on the intro for the show along with Otis, 4th Grade Male Aardvark, and all the main characters.
 * This character is one of few characters with dots for eyes.