Poor Miso 🙁 It does sound like a very complicated surgery that would likely require lots of follow-up care. And without knowing the full extent of issues it’s hard to say, as there could be a lot more going on that you can’t see.
I can’t speak to a completely similar experience… but I did have a bun with a dental abscess. His was due to molar issues. His molars were literally just rotting and practically falling out and the vet had no idea why other than just “bad teeth”. We treated the first abscess successfully, but then he needed more molar extractions down the line. A few months later he died suddenly and a necropsy couldn’t find any real cause. He was just 2 years old and we had only had him for about 6 months. My personal theory is perhaps he had bone cancer that was affecting his jaw, but I really have no idea. 🙁
There was also a bun at the rescue I volunteered at that developed facial abscesses very suddenly after being adopted. The rescue helped get her a CT scan which revealed extensive abscesses throughout her head that were not treatable, so she was sadly euthanized.
I do think it’s always important to think about what’s best for the bun, rather than just what we want as their humans. It sounds like you are very much considering Miso’s well-being.
One thing you might ask the vet is what she would do if it were her bunny. That may be able to give you some more sense of prognosis.
There are also instances where abscesses are treated palliatively with antibiotic injections. This does not cure the infection, but can buy you some time in by slowing the growth in cases where the bun may not be a good candidate for surgery.
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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.