Ha, ha - boy does that video look familiar.
In my house it goes like this:
Brando goes to Ruby in the dog bed (usually the one in front of the stove)…starts pawing and pulling at the dog bed. Ruby makes noise. Brando starts poking her with his paw...Ruby makes more noise. Brando starts really poking her, rolling his head on the edge of the dog bed, and tail starts flipping wildly. Ruby then charges and an all out brawl followed by a b500 ensues. If the noise escalates to angry noise and neither seems to be playing any longer, I will redirect their attention. That seems to only happen at night when they are both tired. Otherwise, I usually witness a shake-off at some point and see the tension break. Oh, and they usually end of sharing the bed after the play.
There is also the Liyah/Brando turf war. Usually over the couch. I can tell instantly if Brando wants to play...as soon as his mouth opens. If he isn't interested he turns away and makes a soft growl. That is usually enough for her to stop. If she keeps at it when he doesn't want to play, I usually let him tell her off with a much more forceful growl...
There are no rules in my house, I let them work it out unless I sense it really start to go in the wrong direction. Brando and Ruby both put their teeth on Liyah's face and vice-versa and both Ruby and Brando put their teeth on each others faces. I watch it and it really seems to be play (or lessons in biting in Liyah's case).
I will say that in my house it can get really LOUD...not for the uninitiated. I also usually stop it if furniture starts being moved around. :eek::D