Mr. Moose Caboose is a Harlequin Great Dane who is just too unsure of who he really is. He has a struggle with identity for so many reasons. He thinks he's a boy, not a dog. His name is Moose, but he knows he's not a Moose. He looks like a cow, but he knows he's not a cow. He's from Buffalo, but he knows he's not a Buffalo. All of these things make Moose uncertain as to how he fits in smaller dogs also reject him because of his size. Moose finally "finds his way" and gains so much confidence. All it takes it to find someone who looks like him to show him he's not alone.