Agree with LBJ10. Their behavior towards each other might also change drastically once your bun is neutered. Litter box habits tend to fly out the window during bonding and pre-bonding, and I imagine this might be even more true when one bun is not neutered yet. So less time having to clean everything would be a good thing in my mind!
That said, if you manage to get your bun neutered ASAP, before he really starts acting hormonal, then you might not have those strong reactions and things might go pretty smoothly. It’s hard to predict though! I am reminded of a past member who brought home an unneutered- baby to bond with her spayed bun (with the intention of neutering the baby). The current spayed bun FLIPPED out and hated the baby, even though they never even interacted. His presence in the house just made her very upset. Even after he was neutered the female bun didn’t like him and the owner wasn’t able to bond them, so she ended up rehoming the newer bun.
Not to say that would happen in your case, but it’s good to imagine different scenarios when making these types of decisions! I’ve also seen positive examples where the young bunny and older bun take to each other very well. So you just never know. A trial run, as LBJ10 suggests, is a good idea.
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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.