The animal is capable of savaging hidden foes when they least expect it.
Benefit: The animal companion can attempt a Perception check as a swift action to intentionally search for a stimulus. When using Perception to attempt to pinpoint an invisible foe, the animal companion’s bonus from the Tenacious Hunter feat increases to +20. In addition, whenever the animal companion successfully uses Perception to oppose a Stealth check or to pinpoint an invisible creature’s location, that foe is denied its Dexterity bonus to AC against all attacks that the animal companion makes before the start of the animal companion’s next turn.
Pathfinder Roleplaying Game Ultimate Wilderness © 2017, Paizo Inc.; Authors: Alexander Augunas, John Bennett, Robert Brookes, John Compton, Dan Dillon, Steven T. Helt, Thurston Hillman, Eric Hindley, Mikko Kallio, Jason Keeley, Isabelle Lee, Jason Nelson, Stephen Radney-MacFarland, Alex Riggs, David N. Ross, David Schwartz, Mark Seifter, Jeffery Swank, and Linda Zayas-Palmer.