PHILADELPHIA (CBS) -- Canine Agility has become an increasingly popular sport as recognized by the American Kennel Club and the United Kennel Club. Agility training started in England in 1978.

They scurry through collapsible tunnels. They bark when they are excited. They listen to their handlers' commands. They are the dogs-such as border collies Gig, Faye and Spot-who have gone through ...