Aq worlds how to get a dark wolf

You cant anymore it was available during a 3 day period, not anymore though. However if you are looking for a non-members pet you can get one by doing the following:

1.Sign up for a Battleon Master Account at portal.battleon.com
2.Link your AQWorlds account to it
3.Play the mini-game BladeHaven
4.Buy a mercenary contract for 200 Battleon Points (which you can earn by doing a survey or two)
5.And bam when you log in it'll be there!