You have tapped into your wolf heritage and learned how to trip a foe that you successfully bite.
You gain the trip special attack, which allows you to trip an opponent as a free action, without provoking an attack of opportunity, when you hit with your bite attack. Your opponent may not attempt to trip you in return. You also gain a +2 bonus to CMB roll when making a trip attempt after biting your foe.
Normal: You can only attempt a trip attempt in place of a melee attack, and it provokes an attack of opportunity from your target.