Dogs can jump in the air and catch a Frisbee. But until humans invented Frisbees and began throwing them to dogs, did dogs know they could catch things like that? Think of the millions of years dogs were just hanging out, keeping all four feet on the ground. And then suddenly a dude throws a disc and the dog discovers he can temporarily fly and catch things WITH HIS MOUTH in midair. That moment must have been huge! No wonder dogs are so happy — they only recently discovered they have superpowers.