It's an international phenomenon. It's unidentified flying discs. It's airborne canines.
It's the sport known as Canine Disc. What you used to call "throwing the Frisbee around with the dog."
Frisbee (TM) is a registered trademark, so they don't call themselves Frisbee Dogs any more. They're Disc Dogs, and it's a serious gig. Just ask the International Disc Dog Handlers' Association. Woo, photos of flying dogs! Well, some of them are.