K9 is dog so what k6?

There's no established meaning for "K6" in the same way that "K9" refers to a dog. It's a common misconception that military or police designations like "K9" follow a numerical system.

Here's why:

* "K9" is a specific code: "K9" is a code used in military and police units to refer to dogs. It's likely derived from the word "canine" and has been used consistently for many years.

* No set system for other numbers: There's no standardized system for other numbers like "K6" or "K3." It's possible that some organizations or units use these codes internally, but they don't have a widespread, publicly recognized meaning.

If you're interested in specific military or police codes, you'll need to look for specific documentation or consult with experts in the relevant field.