Caleb Pemberton

3rd Grade Male Dog is an unnamed third grader who made his first appearance in the episode Arthur and the Real Mr. Ratburn. Just like most of the unnamed characters that have appeared, he is often seen in the background at lunch, in the hallway, or at the playground, and his name has not yet been revealed. He has also been seen hanging out with both major and minor characters. He spoke once during the episode The Scare-Your-Pants-Off Club!, when he and his friends were clapping for the act being performed by Arthur and Buster. One of his friends, 3rd Grade Female Rabbit, was seen holding his hand in the same episode, which hints that he either has a crush on her, is close friends with her, or they are related in some way. He also bought Buster Clusters at Jack's Joke Shop in Buster's Sweet Success.

Appearance
3rd Grade Male Dog is a dog with a cream complexion. He wears a white collared shirt, long red pants, and brown shoes. He also has some hair on his head.

During the winter he wears a black sweater with long white sleeves. In the episode D.W.'s Backpack Mishap he wore red and white colored swim trunks.