Czech teacher

Unknown Male Adult Dog is an unnamed character who made his first appearance in the episode "Prunella Packs It In". He was the teacher who taught the Czech language class at the Elwood City Community Center. His only student was Unknown Male Adult Dog (Number 3). Prunella almost attended his class, but decided not too.

Appearance
Unknown Male Adult Dog is a dog with a tan complexion. He wears a white collared shirt and a yellow sweater almost identical to what Arthur wears. On top of that he wears a green jacket, long olive green pants, and brown shoes. He has brown hair, a brown 19th-century style mustache, and wears rectangular lens glasses.