There is a Legacy version 
here.

Wolf Stance  [one-action] Feat 4*Monk Stance Source Player Core 2 pg. 119 1.1Archetypes Martial Artist, 
Wild MimicRequirements You are unarmored.
* This version of the Wolf Stance feat is intended for use with an archetype and has a different level for access than the 
original feat.
You enter the stance of a wolf, low to the ground with your hands held like fangs. You can make wolf jaw unarmed attacks. These deal 1d8 piercing damage; are in the 
brawling group; and have the 
agile, 
backstabber, 
finesse, 
nonlethal, and 
unarmed traits.
 If you're flanking a target while in Wolf Stance, your wolf jaw unarmed attacks also gain the 
trip trait.
Archetype Use
This feat can be used for one or more archetypes in addition to the listed classes. When selected this way, the feat does not have its class traits.
Wolf Stance Leads To...
Wolf DragTraits
Stance: A stance is a general combat strategy that you enter by using an action with the stance trait, and you remain in for some time. A stance lasts until you get knocked out, until its requirements (if any) are violated, until the encounter ends, or until you use a stance action again, whichever comes first. After you take an action with the stance trait, you can’t take another one for 1 round. You can enter or be in a stance only in encounter mode. You can Dismiss a stance.