Dandelion-Puff

Dandelion-Puff (also known by his nickname Dandy-Do) was a red fox in Assassin's Creed: Valhalla. You begin by saving his life from a burning building, risking your own life to save his. His owner dies from smoke inhalation and in her last dying breaths, she tells you to take care of her fox. When you next arrive in Ravensthorpe, Eivor excitedly greets Dandy-Do.

Then he runs away and doesn't come back.