If K-9 refers to a dog K-6 what?

There's no established meaning for "K-6" in the same way that "K-9" refers to a dog. It's likely a made-up term or a specific reference within a particular context.

Here are some possibilities:

* A specific organization or unit: It could be a designation for a particular group or team, like a K-9 unit but focused on a different area.

* A fictional element: It might be a term used in a book, movie, or game.

* A code or abbreviation: It could stand for something specific in a certain field, like military or aviation.

Without more information, it's impossible to say for sure what "K-6" refers to.