If you don’t recognize Four’s “pet”, here’s a hint.
Confused about the strange hooked shape of Wrathion’s dagger? That’s a type of knife called a jambiya. They do exist in WoW, but it’s highly unlikely you’ve ever come across one, as the only jambiya in-game is a white-quality vendor-purchased weapon.
(This isn’t the one Wrathion has, of course. I doubt the Black Prince would be caught dead with an ordinary, mundane knife.)