When they were puppies, Annie and Beau argued daily about who's the Top Dog in this house.
No one ever got hurt, no one was seriously bitten...just little nips and some grabbin'-hold-and-shakin' type stuff.
They never really settled the issue, but agreed to continue the discussion for the rest of their lives whenever the mood hits them.
Note: In actuality, though, Annie is Top Dog. Although Beau outweighs her by a good fifty pounds, she will give him a pretend butt whuppin' every now and again. And she will sometimes just look at him out of the blue from a few feet away...giving him that Rottweiler Death Stare and showing her front teeth...and Beau simply can't stand up to that level of intimidation, even though he is fearless at other times. He will just leave the room and won't return until he's sure it's okay or I call him.
Man, there's some serious dentition showing there!