Musty is the mutie pet cat of Rhea of the Cöos, it has six legs, the two extra ones hanging uselessly from its sides. It also has milky grey-green eyes and a forked tail split at the end. People are repulsed by its smell because of the combination of its mutie heritage and the fact that Rhea never washes it.
She uses it as a messenger to The Traveller's Rest when she is out of drink.