|"3rd Grade Male Dog" is not an official name.|
|3rd Grade Male Dog|
|Cartoon debut||"Arthur's Eyes"|
He is seen in the background of the episodes, but has been heard speaking in a few episodes such as "Arthur's Substitute Teacher Trouble".
3rd Grade Male Dog is a brown dog that wears a tan sweater, a yellow shirt underneath his sweater, long blue jeans, and orange and white colored sneakers. In "Germophobia" he wears tanned swimming trunks.
Not much is known about his personality, as he is a background character and does not speak much, but he appears to be friendly and hangs out with the other kids.
He plays the tuba in the Lakewood Elementary Band, and may have some interest in videography since he was seen filming the chess match between Arthur and Brain in "A" is for Angry. However, Muffy may have forced him to do the latter.
- The two watched clouds together.
- He attended his pool party.
- Season 1
- Arthur's Eyes 10101
- Season 5
- Season 7
- Season 8
- Season 9
- Season 10
- Season 13
- The Silent Treatment 130201
- Season 14
- The Agent of Change 140201
- Season 15
- This character is in Miss Sweetwater's class.
- In Elwood City Turns 100!, he is seen reading in the background in the library, but Buster and Brain scare him off when they are arguing about the play whether the audience wanted fantasy or accuracy.
- He is one of the few characters that has dots for eyes.