"Unknown Male Adult Dog (Number 5)" is not an official name.
Unknown Male Adult Dog
Bailey lookalike
Gender Male
Animal Dog
Complexion Beige
Cartoon debut "Arthur Loses His Marbles"
Unknown Male Adult Dog is a character who appeared in the background of when Grandma Thora and Arthur were eating the prize of the marbles competition in Arthur Loses His Marbles. He looks a lot like Bailey but is not him as the shapes of their bodies are different.