You can hear most of my commentary throughout the video but a tidbit of info that was lost in the noise is how Griffin referees the other dogs. He likes to play with them but doesn't seem to like it when the play gets too rough towards the other dogs. He tries to convince them to be easier on each other but they realized a long time ago that hes all talk! :)
If you watch close you can see how he tries to separate them with his body...
And Mercury is permitted to be with the other dogs but he has to keep his distance from the playing pups. If someone bumps into him wrong he gets quite offended and that could start a fight. Over the years he has learned, as the other dogs have, that if you fight you loose your free time privilege and are hooked right back up to their house. No one likes to loose free time so the our no fighting rule is easily understood and enforced.
(a few sections of the video are dark in places but you can get a good idea of what is going on)