Funny you should ask this… I’ve written a blog post for Binky Bunny on this topic, but it hasn’t come out yet!
The gist is that different things work for different rabbits, and different humans! People with more or less experience might do better with certain techniques.
I think most people will try a small space first, because it’s readily available (a bathtub is a common starting point). Personally, I have not had great luck with small spaces. I have found in large spaces, the rabbits have space to get away from each other if needed and fights don’t seem to escalate as fast. (Consider the fight or flight response… if you have no room to flee, you will fight). That said, many people successfully bond in small spaces.
I see a lot of blogs, etc. that promote small space 24/7 bonding. I tried this method once… and it was the only bond I’ve that broke. That’s not to say it isn’t successful, but I just didn’t have good luck with it. I also think it is unnecessarily stressful on the rabbits. I would rather let them build their relationship more naturally (although I realize the whole situation of bonding is somewhat unnatural).
Another big source of contention is when to intervene vs. letting them “sort it out”. I think when you are new to rabbits, and especially new to bonding, it’s very hard to know when to intervene. So I think early on in the process, it is better to intervene too soon and help build some trust between the rabbits, rather than letting things get out of hand and backtracking (or ending up with an injury). Especially if working in a small space, I like to do a lot of petting when the rabbits approach each other (just like you did when your two were on opposite sides of the fence). This helps keep everyone calm and start to build happy feelings. Then when things get a little farther along I will pet less, and let little chases and nips play out a bit more, once I’m sure they aren’t just going to immediately lock on to each other. Some bonders might be more willing to allow fur pulling than others, etc.
About stressing: I often use stressing as a tool in the process, but not the entire method. A car ride together before the main session can work wonders. But it’s not the only thing I do.
It can all be very overwhelming, but it’s really a process of trial and error with your rabbits (unless you get really luck and they just love each other LOL). This slide show by the Georgia HRS is really similar to the process I tend to use, and what is practiced at the rescue (they call it the “gentle bonding” method): https://rabbit.org/articles/wp-content/uploads/2016/06/Bonding-Bunnies-PPforrabbit.org_.pdf
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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.