It’s pretty normal for unbonded rabbits to be aggressive when not in neutral territory.
You might look into getting some “nose guards” so they can sniff and see each other, but not nip each other. Here’s what I like to use:
Nose guards?!!
You can use the panels to make the barrier between them. I’ve found my buns can jump over a fence made from 2 panels, but they can’t jump over three panels. Swapping sides should also help things calm down, but it may take several weeks.
It’s really important to prevent aggression from happening at this stage, because it can make bonding harder.
Also just to comment on your original comment about nails, biting tends to cause more injuries than nails (in my experience). You will want to work very hard in your bonding sessions to prevent fighting from happening at all. Have some thick leather gloves on that cover your wrists to make sure you can deal with fighting if it happens. In the beginning, it’s OK to err on the side of intervening too early, rather than too late. Since yours have a history of fighting, your goal will be to promote feelings of calmness between them so things dont immediately escalate to fighting.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.