Getting her spayed is definitely a good idea for long term health, so good job on that! And good job doing your homework on it before hand.
The first tip is to confirm that your vet very experienced with rabbit spays. A good test is whether they tell you to fast her before surgery. Bunnies should NOT be fasted before surgery, so if they tell you to, that should be a red flag to go to another vet. That said, my vet has said to skip the big pile of veggies right before anesthesia, but they should never tell you to take away hay or water.
The other big thing is to make sure they send you home with pain medication and critical care in case she doesn’t start eating again right away. Pain medication is crucial, and sometimes you need to do a syringe feeding or two just to get them going again after anesthesia.
You might even want to pick some up now, and see if she’ll eat it readily. Some buns love the taste, so if you get them used to it before they need it, they think of it like a treat.
When she comes home, she will appreciate a place that is warm and quiet. You should make sure her area is set up so she can’t jump up on anything, and you’ll need to restrict her space while she heals (the vet can tell you for how long exactly).
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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.