So far, in my Pathfinder Society game, my level 1 witch's fox familiar has:
Successfully tripped a man possessed by a monkey demon-spirit
Killed a vargouille
Killed a skeleton via a Cure Light Wounds spell
Revived our cleric via a Cure Light Wounds spell
Squirmed in through a knothole at the bottom of a display case to unlock it from inside
Leapt up to an archway (ground to dwarf's shoulder, shoulder to archway) to attempt to dislodge an evil artifact animating zombies
Charged down to finish off a zombie with a bite when his lack of opposable thumbs prevented him from unscrewing said artifact
Consistently succeeded on saves failed by most other party members, including the vargouille's screech thing and a Color Spray
Dealt around 30+ damage over the course of two adventures
Dodged about 10+ attacks over the course of two adventures
This is the most awesomest fox in existence. Also, the bravest member of our party, from what I've seen.