I’m very surprised that your buns were bonded before being fixed! Are they very young?
If they are young (which I suspect they are), you will probably end up needing to rebond them once your girl’s hormones settle, since she will likely smell very different, and she will be recovering from surgery. Is the other bun already fixed?
I think many on here will recommend separating they buns after her spay, and waiting for at least 4 weeks for her hormones to settle before re-bonding them, but I am not really sure what to recommend without knowing how old your buns are and whether the other one is fixed.
IF you had two adults who were truly bonded, the advice would be to send them to the vet together. It is very common for bunnies not to recognize their partners after they are at the vet for a long time, plus your girl would likely want to comfort when she wakes up from surgery. BUT, like I said, that advice prob doesn’t apply in this situation!
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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.