Flyball is a fast-paced dog sport that involves teams of four dogs racing against each other. Each dog must jump over a series of hurdles, trigger a spring-loaded box to release a tennis ball, and then return over the hurdles with the ball. The next dog can only start once the previous dog has returned, making it a relay-style competition. The goal is to complete the course as quickly as possible without any mistakes. Flyball promotes teamwork and agility, and it is enjoyed by dogs of various breeds and sizes. Competitions are held at different levels, from local events to national championships.