Hannah is definitely the alpha, but Tucker lets her go only so far before he says "enough" and then they get into it. Fortunately he has an extremely high tolerance level.

Between Hannah and me, well in our own minds we are each the alpha. It really works out better this way, rather than my asserting my dominance in all things. She gets to get up when she wants to and go potty when she wants to, items that were real issues for her!