You might want to check the PetBunny vet list for an experienced rabbit veterinarian in your area.

Ask your vet what preparations you should make before taking the bunny in to be spayed. He should tell you that the bunny is allowed to eat prior to surgery. Many vets who are not familiar with rabbits will tell you that the bunny should not eat for 12 hours prior to surgery. Vets familiar with rabbits know that, unlike cats and dogs, bunnies do not vomit and they recover from surgery faster if they eat until about 2 hours prior to surgery.

If the bunny is old or is a recent rescue, you might want to have the vet do a blood panel to make sure the liver and kidneys are functioning properly before having the bunny put under anesthesia. (Certain beddings can affect liver function and you might not know where the bunny was kept before you rescued him/her. If the bedding was causing a problem, the liver function may return to normal after a month.)

You should ask your vet if he/she uses isofluorane gas as anesthesia. Most vets now use "iso" because it is safer, though a few very experienced rabbit vets might choose to use other anesthesia which may require intubation (difficult to do in a rabbit because of their narrow trachea). Sometimes inexperienced vets hit a nerve in the hind leg when using injectable anesthesia (like ketamine) and cause the bunny to be paralyzed in that leg -- a tragic result. I believe that isofluorane gas is by far the safest anesthesia for bunnies.

IMPORTANT: A rabbit's heart and respiration must be monitored closely during surgery. Depending on the level of anaesthetic administered, bunnies undergoing surgery may begin to feel stress/pain at some point during a procedure. This causes their hearts to race, so the vet needs to back off for a moment, adjust the level of anaesthesia, and make sure the heart rate returns to normal before continuing with the surgery. This is extremely important because, unlike cats and dogs, bunnies' hearts cannot be allowed to "race" or the bunny will die from cardiac arrest. Many bunnies die under anesthesia because inexperienced/careless vets do not monitor the heart and assume that bunnies can tolerate a rapid heart rate.

On the other hand, when higher doses of anesthesia are used to prevent pain, respiratory depression can occur (rabbits are more prone to the respiratory depressant effects of certain drugs). When rabbits stop breathing, resuscitation is very difficult.

According to Hyllier and Quesenberry, the margin of safety of many of these drugs is very narrow for rabbits, so it is essential to monitor parameters closely to prevent any of those two factors (heart racing or respiratory depression) from occurring. Susan Brown describes the parameters which should be monitored during anesthesia in rabbits: respiration, heart rate/pulse, body temperature, reflexes.

Ask your vet for a pain killer. See Dr. Chark's Drug Calculator for drug dosages. Rabbits recover faster if they are not in pain.

A spay is serious internal surgery. It took 3-5 days before my girls were moving normally again. It took only a day or two for the boys.

Make sure the bunnies have their favorite treats available when they wake up.

They might not want to eat pellets or hay but usually bunnies will eat veggies and herbs (carrot tops, parsley, basil, mint, dandelions, romaine, kale, etc.) after surgery or when they are sick. Give the bunnies whatever they'll eat.

They might be hurting and might not want to hop, so you may need to cut the litter box entrance out a bit (or create a step using a folded towel) so they can "walk in". They might not want to poop for a couple of days after surgery because of the pain.

Make sure the vet provides some pain medication because a pain-free bunny eats, relaxes and heals more quickly.

Warm compresses lightly applied to the genital area will provide pain relief for a recently neutered male bunny.

Make sure the bunnies don't get cold. If they do, you might want to put a clean bath mat/towel on top of a heating pad set on low - leave half of the mat without heat so they can get away if they become too warm. Another option is warming up a towel in the clothes dryer and draping it over them, but they may not like this.

Don't forget to pet the bunny often; she/he will need a lot of TLC.