Chihuahuas from across the country will compete this Labor Day weekend at the 4th annual PETCO Unleashed races, where one winner will be crowned “America’s Fastest Chihuahua.” 15 top tiny racers each won regional races in their hometowns this year, and represent Boston, Chicago, Dallas, Denver, Houston, Los Angeles, New York City, Orange County, Orlando, Phoenix, Sacramento, San Diego, San Francisco, Seattle and Washington D.C. Visit www.petco.com/petcounleashed to learn more about each finalist. The tiny racers will be brought together in front of thousands of roaring Chihuahua and baseball fans between innings of a San Diego Padres baseball game at PETCO Park on Sunday, August 31, after the game’s first inning. The PETCO Unleashed championship race will determine whether last year’s winner, 3-year-old Maddy of New York City, will retain or lose her title. The grand prize winner will receive bragging rights, a trophy, a one-year supply of Royal Canin Chihuahua dog food and a $300 PETCO gift card. Prizes will also be awarded for second and third place.