The Hallo-Wiener is a children's book by Dav Pilkey and published on September 1, 1995, by The Blue Sky Press.

The story begins with Oscar, a dachshund who is described as "half-a-dog tall" and "one-and-a-half dogs long".

He shows concern about getting laughed at, but wears the costume anyway, because he does not want to hurt his mom's feelings.

They scream very loud and run, diving into a river because they see a scary monster.

He bites the cover of the monster, pulls it off, and discovers two cats hiding underneath.