If Mr Trejo was ok with it I could knock out a script in like 24 hours or so. Nothing fancy, not high art. I could get it done though.
Danny Trejo in Pawn Shop: an old man with a couple pet Chihuahuas saves a pit bull destined for an underground fighting ring. The fighting ring attacks his pawn shop in retaliation and the pit bull takes them apart.
The old man hides the pit bull with his granddaughter, and tells the police the Chihuahuas did all the damage.