Horn of the Black War Wolf

Source
This item is a PvP reward, and can be purchased for from  outside the Hall of Legends in Orgrimmar alongside the other PvP reward mounts.

Appearance
The black war wolf has red armor Covering its black matted fur, decorated with the Horde symbol on the front armor pieces. Underneath, there is a small red collar with a golden emblem, tied with black leather straps, and also a leather harness. The saddle is Red and has a small piece of folded cloth to the rear of it.On the forelegs, there are small red Leather bands. The wolf has very long, black claws. The eyes are glowing blue, and the wolf wears a bronze head piece tipped with spikes. It looks similar to the Frostwolf howler, albeit being Red and black. It has many sharp teeth and a pair of ivory tusks like most other wolves.