From Pathfinder Howl of the Wild, which isn't enabled.

Nature's Precision

FEAT 6

Prerequisites Beastmaster Dedication; animal companion with an agile or finesse unarmed attack

Your companions pick at an enemy's weak points. When your companion strikes a Off-Guard creature with an agile or finesse unarmed attack, it deals an additional 1d4 precision damage (2d4 if the animal companion is specialized). If the companion already deals precision damage, combine the precision damage.

Pathfinder Howl of the WildORC