Maryann's father

Unknown Male Adult Dog is an unnamed character who made his first appearance during the episode Bleep. He is the father of Mary Ann and possibly the father of Unknown Male Dog and 4th Grade Male Dog (Number 2).

Very little is known about him because he rarely appears and has never spoken at all during his appearances. He is most likely a caring parent, as he is seen hugging his children after they get finished with their day of preschool.

Appearance
Unknown Male Adult Dog is a dog with a cream complexion who wears a a white colored shirt with buttons on them, a gray vest, long green pants, and black shoes. He also has some short black tuffs of hair on his head.

Trivia

 * He appeared in the episodes Bleep, My Fair Tommy, and Emily Swallows a Horse.