|A Why-wolf with glasses|
In the episode "Donny," a Why-wolf describes his species' place in the food chain: The Why-wolves are usually kept in check by Obnoxygen, a gas produced by Donny the ogre that is deadly to Why-wolves. However, if left unchecked, the Why-wolves would eat the House People and grow in population until they attract the Cosmic Owl, who will subsequently devour them.
They resemble classic, modern werewolves, although simply by tearing away tufts of fur, they transform into more civilized versions of themselves. After this transformation, they wear grey suits and glasses.
It has been seen that some Why-wolves have two heads with one eye on each.
- According to a post on the Frederator Blog, Marceline's dress in "Henchman" is made from Why-wolf skin. Ironically, Marceline turned into a wolf to scare Jake.
- Their species name is a pun on "Werewolf."