Filbert the Fox is a red fox that you can find in the Riverwood trader's house on the second floor.

Filbert does not have any custom voice acting. He also doesn't give you any quests at this point in time, though I am working on making a quest series for him and I will release it in the near future.

Filbert works just like a regular follower, you can store items with him, have him do specific tasks, ETC.