Fairly simple concept.
Choose a spot in Isle of the Nameless.
Place there a Dire, Hearty, and Elder Wolf, along with a "Master of Beasts" NPC.
EDIT: Ideally, these are charmable wolves, if only for PvP players.
The Master of Beasts explains the difference between the different pets and will take a pet away from you if you want to get a different one.
If it is particularly important, you could make the wolves not spawn if there is a non-PvP only character in the part you bring into Isle of the Nameless, to preserve the difficulty in getting a certain kind of pet for PvE players.
S


