It is very normal to be concerned about spaying, and ultimately you’ll have to make the decision. Hard decisions are a part of pet ownership. But here’s what I can tell you:
We have had many many many members over the years who have spayed their bunnies with no complications. It isn’t without risk, and you need to have a good vet, but in general the procedure is very safe. Talking to your vet about the amount of spays they do and the rates of complications would likely help you.
We have also had many members who did not spay, who’s rabbits then had to undergo an emergency spay later in life (when it’s more risky), or the animal passed away of cancer. There is currently another thread about a rabbit who is passing blood clots and likely has cancer. Generally the attitude of these owners has been “I wish I had spayed earlier”.
Personally I have seen a few older rabbits come into the shelter where I volunteer that were unspayed, and they all had cancer. They were spayed to remove the tumors, but it’s unclear whether they will come back later. While I was actively at the shelter there were probably over 100 animals spayed and neutered. There was one rabbit that very sadly died during a spay, and it was VERY upsetting to everyone because it happens very rarely, and our preferred vet hadn’t done the procedure. Even one loss was unacceptable, which shows you that it’s normally a very rare occurrence.
You may feel like it’s a guarantee that something horrible will happen, but the odds of cancer are MUCH greater than the odds of spay complications. Deaths due to spays are extremely rare when the vet is rabbit-savvy. It’s hard when you read about things on the internet, because most people don’t post about their spays and neuters going well (they only post when things go wrong).
I think you realize that it’s an irrational fear, but saying they will for sure die if you spay them now just isn’t true. But it’s very likely they will get cancer (studies have found cancer rates of around 75% by age 4, and the rates just go up as the rabbit ages).
I have a feeling that if you don’t end up spaying them, you will continue worrying about it (as you are now). If you get them spayed, you will be following the recommendations of basically all rabbit welfare organizations and veterinarians, who wouldn’t be recommending something that is likely to kill a bunny before cancer would.
Like I said in the beginning, it’s ultimately your decision, and has to be made based on how much you trust your vet. Some people will drive an hour or two to get to a trusted vet if needed. Talking to your vet about the procedure and after care is important, and might help with some of your concerns.
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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.