Fox Kit is a BOP drop from foxes in the normal daily questing zone of Tol Barad Peninsula. This is not the "join for battle" zone, but it is contested which means players on PVP servers will be flagged for PVP combat.
The droprate of this pet is currently unknown, so if you plan to farm it please download the Wowhead Client to help them get accurate droprate numbers. I'm going to guess it's a 1/1000 pet.
Oh, and it DANCES.