You are skilled at bringing down animals (and animal-like monsters) with bolas.
Prerequisite: Handle Animal 5 ranks or Profession (herder) 5 ranks.
Benefit: If you make a trip attack with a bolas against a creature with more than two legs that has moved at least 30’ in its last turn, you may elect to have the creature use its own Strength score rather than your own to resolve the trip attempt. A target affected by this Skill Trick does not get any bonus to resist the trip attempt because of its size (but this Skill Trick does not allow you to transcend the normal prohibition on tripping a creature more than one size category larger than you).
Skill Tricks are from Complete Scoundrel and are explained here
Opinions? It may be a bad precedent to allow a Skill Trick which modifies combat rolls, and the skill never actually comes into the equation: maybe I could allow a Herder skill check in place of the attacker's STR check?
Edit To mention bolas in the detailed text and de-emphasise "animals".