Huan

Huan was a great wolfhound of the First Age. He was given by the Vala Oromë the Hunter to his friend Celegorm, one of the Sons of Fëanor. Huan was as large as a small horse, and accompanied Celegorm on his huntings. When the Ñoldor under Fëanor rebelled, Huan went with his master to Middle-earth.
Huan had been granted special powers by the Valar, and was allowed to speak three times before he died. It was also prophesied that he could not be killed unless it was by the greatest wolf that ever lived.