Hi there,
It might be easiest to confine Oreo while you are bonding. Mostly I think this would make it easier to do pre-bonding with all three. Otherwise you’ll want to rotate who is free-roam.
In terms of the space you use, anywhere that Oreo has been will not be neutral. So you might need to get creative. A friend’s house, a pen in the backyard, a pen in the garage, your kitchen table, etc. The more neutral the better (ideally they won’t even be able to smell where they are).
Whether you work on two at a time or all three is up to you. Since you seem a bit nervous, it might be better to work with different combos of 2 to get a sense as to which pairing will be the most difficult. Ultimately the dynamics change with all three, so eventually you will need to work with all three together, but it might be nice to start with two at a time.
In the early sessions you should be in the bonding area with them (or right next to it if it’s a small space so you can reach all bunnies). I’ve always had better luck with larger bonding spaces (vs. small ones). When they approach each other you can pet them to calm them down and swap scents. This helps build trust and a positive association.
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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.