Unknown Male Sheep

"Unknown Grade Male Sheep" is an unnamed character that appears in "D.W.'s Library Card". He stands in the line to check out books when D.W. is asking for the first time if Hopalong The Frog has been returned yet.

He looks similar to Mary, just like Aloysius Zimmerplotz looks like 3rd Grade Female Cat. In fact, both are male doppelgangers of female 3rd graders that only appear in "D.W.'s Library Card".