Jade Tiger

Summons and dismisses Jade Tiger, a housecat companion.

Source
Warcraft Pets.com writes: "This pet is available for a limited time to all players on China servers if they log in with a character between October 19th and November 24th 2009. This gift is given out via an in-game mail to welcome players back to Azeroth after Chinese servers had been offline for several months. In addition to receiving this pet, logging in also also earns eligible characters the achievement."