So, having the bun sin side-by-side pens for them to get acquainted is great. I suggest setting up side-by-side x-pens so you have a buffer of space between them so they can’t nip noses through the fence. Then each bun has a “home base”. Bonding can take a few weeks in cases of easy bonds, or as long as a few months in tougher bonds, so it’s important to make sure you have a decent set-up for them during that time.

But, you will need a truly neutral space (where neither rabbit has ever been) for actually bonding sessions. If you just let them out at the same time in the room they have spent time in they will very likely fight.

Do you have an area in your home where you current rabbit has never been? I used to use my bathroom for bonding when I lived in a studio apartment. I’ve also had friends let me use their garage for bonding sessions when things got longer and I needed more space.

Another consideration is that although most bonds do work out if the proper bonding process is followed, there are some times where the pairing just isn’t a good match. So you should have a plan for if that happens (either finding a new home for one bun, or keeping them separate permanently).