Invariably the dogs will sort themselves out, but because we treat them equally, or are not aware of who is actually the dominant, we treat them wrong,and the problem escalates to bad fighting. The most important thing to do is to make sure that you are top of the hierarchhy by giving all interactions and privileges on your terms. This will surpress fighting lower down the ranks in the pack. I bet she doesn't look at him, but keeps her eyes down. She won't go straight at him, but pretend, in a way, that she doesn't want to catch him, but then casually go up to his neck and give him a stroke.
Ferrets bite in two manners.
One is play biting, and therefore part of interaction, and the other is predatory, which often leads to nasty bites. If it is the first form, then you would be advised to walk away from your ferret and stop interactions each time she uses her mouth. If it is predatory, then make sure she's getting a chance to enact lots of active and predatory-type play in a more appropriate manner. For example, hiding food down cardboard tubes, or using dog Activity Balls as a means of feeding. I have a pair of guinea pigs which I handle every day, but still seem to be frightened of me.