Brownie is not as willing to play with Bow, but Leo, who is full of puppy spunk, really does seem to enjoy it.
Leo sometimes seems more committed to the game than Bow.
Both Bow and Leo get a lot of exercise out of the interaction, but Leo jumps higher.
As you can see in the video, the game is entirely consensual, and anyone can stop at any time, In this case, Leo lost interest first. It seems Brownie found a boulder sized rock and was carrying it in his mouth, and Leo decided to join him.
It's nice to have friends to play with. And it's good that every party to the game can decide for himself when the game is over!