Hobby Dogging is Canine Agility with Imaginary Dogs

Hobby dogging takes its name from the hobby horse, which itself has spawned an eccentric sport. But in hobby dogging, participants lead imaginary dogs through real canine agility competition courses. This activity began in Germany with humor in mind, but has become at least semi-serious to participants who see it as a way to socialize and develop communication skills.

-via Aelfred the Great, who quips "Affection for commands, order, and training without anything as dirty and distressing as life, it’s the perfect German hobby."