Your understanding of dragons helps you to easily avoid breath weapons.
Benefit(s): You gain a bonus on saving throws against breath weapons and fear effects equal to half your favored enemy (dragon) bonus. Whenever you succeed at a Reflex saving throw against a dragon’s extraordinary or supernatural ability that would deal half damage, you instead take no damage. If you already have the evasion class feature, you instead gain an inquisitor’s stalwart ability against dragons’ extraordinary and supernatural abilities.
Pathfinder Player Companion: Monster Hunter’s Handbook © 2017, Paizo Inc.; Authors: Eric Hindley, Mikko Kallio, Luis Loza, and Christopher Wasko.