Why didn't I know about this race before it happened? We so could have used the prize money! On August 31, the fourth annual PETCO Unleashed National Chihuahua Race took place in San Diego. Tiger won the race, reclaiming his title from his 2006 win. Over 2,900 competed to race in the finals. I am so going into training for next year's competition. I'm already fast as lighting since I have to run away from Chip cat when she chases me down the hall.