Scent

 
Prerequisite(s): Wild Shape wolf form
 
Benefit: You gain extraordinary olfactory capabilities, regardless of your form. This special quality allows a creature to detect approaching enemies, sniff out hidden foes, and track by sense of smell. Creatures with the scent ability can identify familiar odors the same as humans do familiar sights. The creature can detect opponents within 30' by smell. If the opponent is upwind the range increases to 60', if downwind it decreases to 15'. Strong scents such as smoke or rotting garbage can be detected at twice the previously stated distances. Overpowering odors such as skunk musk or Troglodyte stench can be detected 3x the distance. When a creature detects a scent, the exact location of the source is not revealed - only it's presence somewhere in range. The creature can take a move action to determine the direction of the source. Whenever the creature gets within 5' of the source, it can be pinpointed. A creature with the Track Feat and scent ability can follow tracks by smell, making a Wisdom (or Survival) check to find or follow a track. The typical DC for a fresh trail is 10. This DC increases by 2 for each hour the trail is cold. If the creature being tracked has a particularly strong scent or has masked it's scent can cause the DC to decrease or increase as well. Creatures tracking by scent ignore the effects of surface conditions and poor visibility.
 
Source: Complete Adventurer