When they weren't busy winning Ironman triathlons and coaching athletes to national success, the trainers behind Multisports.com spent their time like many Americans: hanging out with their favorite pooches. Eventually, the team found a way to incorporate their four-legged friends into their runs, as well. Thus, the Petco 5K9 Walk Run was born. Now a national series of 1-mile and 5K runs, the dog-friendly events promote outdoor activity while raising funds for local animal welfare groups with the help of the Petco Foundation. In addition to hitting the course with their pets, participants can also discover the latest exercise innovations during a visit to the event's health and fitness expo.