Naga

Korra's Animal Guide is an animal guide that somehow came into the possession of Avatar Korra.

History
Most of its history is unknown, however, at some point it met Korra and became her Animal Guide. It is most likely a Polar Bear Dog, as co-creators Michael DiMartino and Bryan Konietzko stated that one of Appa's early concepts may appear in the future. The concept looks highly similar to this creature.

Trivia

 * The image of Korra's animal guide was unveiled at San Diego Comic Con.