There are 2 tameable creatures with this look.
|Fields of the Eternal Hunt, Halls of Valor (Dungeon)|
|120||Dunwald Ruins, Twilight Highlands (Vulpera Allied Race Recruitment Phase)|
|This black worg only seems to be available during the Vulpera Allied Race recruitment questline which means it's only ever available to Horde hunters, and possibly only once ever on your account. See Wowhead's Vulpera Allied Race Guide for more information on how to unlock this race.|