Today I twice had occasion to shoo Bridget away. Once (as described in the previous entry) was to make her leave so that Chloe and I could spend some time together. The other time was when I was talking to a friend over the gate. Bridget came up and kept backing into me so that I could scratch her tail. I finally got sick of it and sent her away so I could continue my conversation in peace.
Both times, I sent her out of my space for a valid reason, rather than as a random exercise of authority.
I wonder if that's the right way to think of dominance - you should exercise it only when you have a legitimate need to do so.
Still thinking this over.