Big or small, any dog can participate in agility training. But, some breeds are better suited to the task, enjoying the fun of zipping through tunnels, leaping onto seesaws, and jumping over poles.

Eyes ablaze with focus, the black-and-white dog heeds the start cue from her handler. She makes a jump, sprints up an A-frame, darts into a tunnel, shimmies through the weaves like a slalom skier, ...