I'm not entirely sure as I haven't seen them do much of dominant behavior as of yet.
When I first bonded Zakura and Cloud, Cloud tried to hump Zakura but that could easily be because he was just recently neutered (about 3 weeks prior) and still had some hormones left in him.
Now I mostly see them both run around like maniacs in the run when I come to feed them, or in times of calmness they just lie side by side.
I know that Cloud is more timid when it comes to me, but he has proved (by his reaction to meeting Zakura) he doesn't have the same shyness about other rabbits.
I have two does living together (Aroma and Miako) too where I just assume Aroma is the dominant, as she is Miako's mom, 2 years older and Miako is still very young.
Also since they often have a habit of eating out of the same bowl (despite having two) at times I have seen Aroma trying to cover it from Miako occasionally, until Miako notices the other bowl and eats from that instead. I've never seen them fight over food
(Cloud and Zakura however do sometimes... oddly this tends to happen when I don't use bowls at all, and just throw pellets around randomly on the ground :lol: But it doesn't last long enough for me to notice any "winner" of the fight)