Hiya, I have 12 bunnies and speak from experience not as a medical expert. 2 entire boy bunnies would be a battle till the death....no doubt about that! I do have a pair of entire girl bunnies who are from the same litter, never been parted who do live together very happily, but this is a very rare thing, as a rule 2 entire girl bunnies can be as viscious as 2 entire males. As already mentioned, have the bunnies done, and they will be in bunny heaven in their big hutch.......keep them seperated for a few weeks after op thou, as hormones still active for quite a while!!!