Filmed at the 2015 Westminster Kennel Club dog show. Wikipedia has a wonderfully comprehensive article on dog agility competitions.
Dogs run off leash with no food or toys as incentives, and the handler can touch neither dog nor obstacles. Consequently the handler's controls are limited to voice, movement, and various body signals, requiring exceptional training of the animal and coordination of the handler....Lots more details re the individual obstacles and the training techniques.
Because each course is different, handlers are allowed a short walk-through before the competition starts. During this time, all handlers competing in a particular class can walk or run around the course without their dogs...
Each dog and handler team gets one opportunity together to attempt to complete the course successfully...
Dogs are measured in height at the peak of their withers (shoulders). They are then divided into height groups... Dogs are further divided into their experience levels...Dogs are not separated by breed in agility competitions...
Reposted from 2015 because I was inspired by watching video of the 2018 competition this week, and another video of an 8" Papillon winning this year.
Reposted once again to add this video:
And this tiny dog:
And if that's not enough, here's a "best of" compilation:
Related: Once an agility canine, always an agility canine (paraplegic dog).
Addendum: Rehearsal for first dance at a wedding.