Okay our two pups, Gunnar and Tank, have apparently taught themselves how to toss a ball to each other! Let's see if I can explain this...
one will grab the Kong ball (the only thing they can't chew up and destroy in 2 seconds), sort of nod their head (much like a horse does), then after a couple of head nods will toss the ball causing it to bounce around, the other dog then goes after it and they have a lovely tussle with much puppy growling
awhile later the other dog will do this...
now Gunnar has always sort of tossed a ball this way but is it possible that Tank can have learned this from Gunnar? It's absolutely hilarious to watch and they amuse themselves for ages playing ball together.
I had a Labrador Retriever years ago that taught herself to play fetch. Whenever we weren't available to toss the ball for her she'd grab it, race to the top of the stairs, toss it hard down the stairs (with this same sort of head nodding business), bark madly and bound down the stairs to fetch it herself, then back up the stairs (she'd happily do this over and over LOL).
Dogs are goofy but sometimes I think smarter than we give them credit for. :)