Dax is Kai's ferret, very intelligent. Can't speak, but can pick locks, scout areas, create distractions, and other thief-y things. xD Teaching him new skills is what Kai does in his free time.
For the most part, Dax's markings are very similar to a real ferret, but he has a distinctive dark chin, and a sort of "ninja eye mask" marking that starts behind his eye.