Hello everyone,
We have three lovely bunnies, who each love their humans. The little boy loves both girls, and they each love him.
But the girls hate each other on sight- it's like Deathmatch 2000 if the much larger (but younger) one sees the older more gentle one, and tries to pick a fight...
They're housed separately, so the young girl and boy have run of the house, while the older girl has had the sunroom converted into a run just for her. Unfortunately the girls keep peeing along the boundary fence (a sturdy dog-crate-style-fencing), so we tried covering the panels, but it didn't help- just stopped them being able to bite at each other.
The boy visits the old girl every day, grooms her, keeps her company, and then asks to be let out again. It works well, and would be fine if only the girls didn't see the need to try to out-pee each other along the boundary every single day...
So, we're hoping to bond all three, so we can do away with separate runs, and hopefully, all the territorial peeing!
We tried to bond the girls many many months ago (yes. both are desexed), but they wouldn't stop lunging and biting, and we just gave up, thinking it a lost cause. We'd really like to try again though, so any helpful advice would be appreciated.
Today's bathroom-bonding was peaceful, but only because each bunny was being restrained by a human the whole time...too close to each other, and the big girl just wants to throw herself at the other one. 
We're hoping that 10 minutes a day in 'neutral territory' with each being restrained and patted in close proximity might help....or maybe, having all three in there, with the little boy as peaceful go-between, to reassure both?
It seems the big girl is very angry towards the old girl, but also quite wary of her. The poor old thing is just defensive, and would much rather be submissive and be groomed, but that ain't going to happen any time soon we fear....