Type: Wild
Source: Complete Adventurer
While transformed into the shape of a wild animal, you can savagely tear at any creature that you manage to grapple.
Prerequisite: Wild shape, sneak attack.
Benefit: While you are in a wild shape, any time you make a successful grapple check to damage a creature with which you are already grappling, you can add your sneak attack damage as well. Creatures not subject to sneak attacks don't take this extra damage.