Try bonding them in a small box. You can pick it up and move it around to break up the fights. try turning on a vacuum also to break up the fights. If its nice outside take the box outside. I had a horrible time bonding my 2 but finally got them bonded using a box. I think there is still some hope for the two yet.
I am not sure how you have the rabbits set up but I would keep them away from each other. Only let them see each other during bonding. Oh and I forgot to mention that you should take a couple of days off before you restart the bonding process. It will help calm things down. I wish you lots of luck.

To answer your question the box size I started out with was just a cardboard box just big enough where they fit closely together. There wasn’t much room to fight.

I have a male and a female and my male was extremely aggressive toward my female. He would never just greet her and then fight he would blindly start attacking biting ripping fur etc. I would always break up the fights. I have written a thread on my bonding on here. It took around 8 months of on and off bonding to finally get them bonded. At one point I totally gave up. I feel like if I could get those two bonded I think any 2 bunnies could be bonded. The box and stress bonding is what worked. Just be patient and persistent. Hopefully it works for you.

Oh and once they seem to do okay in the small box you could move up to a bigger one or a bigger space. I built a bonding box with NIC grids. I used it for a long time then went to an xpen made small then full size. When bonding in the xpen I would periodically take them out and stress them in the box. I used a stroller and put their box in it and took them for a short walk outside.

I hope that helps and let me know how things go with your guys!

Has your boy been neutered?
Hmm.. this is a difficult one because on one hand, buck no2 will still have some lingering hormones but yes pretty much any pair can be bonded if the right approach is taken and limitless time allowed but then there’s always the few exceptions that just won’t bond no matter what. Then there’s the question of how long the bond will last? Because there is risk that their bond will be broken, especially if they are being so stubborn at the moment. It seems as though you have tried so many methods to try make this work , which is very commendable, but do you think your bunny is trying to tell you what he really feels?

If you had the space, time and money, why not keep buck no2 separate and find them both a partner that’s more suited to them? Then you’d have 2 happy pairs instead of one ticking time-bomb of pent up male dominance!

Your situation is also more difficult because you have 2 males: notorious for being the most difficult gender combination!

This is the case for mature rabbits – and not kits (obviously). With regard to bonding, what I have learned is: if it is going to work, it takes time; although a rabbit can breed after a few months, I have found that bonding mature rabbits can take over 1 year, and then there is still this “territory” business; it never goes away. What I have also found (in some instances) is that once the kits mature, they can be very aggressive towards the parents and grand parents; more so than visa versa.

It can take 4-6 weeks for hormones to calm down after neutering. Since your new boy was neutered 3 weeks ago and you’ve been doing bonding I think this might be a part of the issues you’re having. I would take a break from bonding, keep them separated completely, and in 1-3 weeks try a short session in a neutral area. This can give you a guage of what you’re dealing with absent of any hormones and allow you to build a better plan from there.

I have 5 rabbits bonded together. Three males and two females. I don’t think gender has as much to do with bonding as personality.

I wish you luck with this! I am sort of in your same situation and really feel for you. It’s so discouraging when this happens because you desperately want to provide your original rabbit with a friend. I personally just got a second male as a companion to my Dutch male, and I am going to start making a serious effort when my new rabbit is neutered. This will be challenging because 1. My new male is five months, while my Duch is seven years, 2. The new male is not yet neutered,3. The new rabbit is a New Zealand white- he’s big! And 4. They are both males, of course!

If you do have success, will you please update me? Perhaps send a message? I really do wish you all the luck in the world!