Fin

Fin is one of the eight sled dogs you can adopt at the beginning of the game.

Fin's Quest
When Fin finds a scent trail, you are given the option to follow her. She finds a skunk, and your character has the option to comfort her, telling her she's sure she'll find other things next time.

After speaking to her at camp, she may steal your beanie overnight, and your character comments that Fin must be comforted by your scent. You must talk with her one additional time at camp, and then, next time you go to sleep you are given the option to give Fin your beanie. Doing so will result in the Cold status condition (which can be fixed by starting a fire), but afterwards you are able to pet Fin. Fin will find another scent trail, and when you follow her, she will lead you to one or two bullets buried in the snow. After this event, text will appear saying that Fin feels safe and trusted.

Completing all of this will reward you with Fin's picture in the journal.

Fin's Abilities
Fin will find bullets for you after completing her quest.