pf2e.fyi
From Pathfinder Howl of the Wild, which isn't enabled.

Bestial Protection

FEAT 6
ARCHETYPEEMOTIONFEARMENTAL
Archetype Beastmaster
Prerequisites Beastmaster Dedication; animal companion that's Large or greater

Your companion's mere presence is enough to rattle creatures that fall under its shadow. When a creature adjacent to your animal companion that's smaller than it targets you with an attack, that creature becomes Frightened 1.

Pathfinder Howl of the WildORC