I’m so sorry for your loss, he was an adorable bun. 🙁
I think it’s very very unlikely that the smoke or cleaning caused this, so please don’t beat yourself up. Very sadly sometimes buns die very suddenly with very few warning signs. Often the more sudden, the less that can be done to help them.
Did you notice whether he ate his dinner normally the night before he passed? Usually low or lack of appetite is the first (or only) sign something is wrong with a bun. It would take a lot of smoke inhalation to kill a rabbit (like a house fire), and you would have seen other symptoms if he was bothered by it. I used to live in a studio apartment with my buns and cooked often… sometimes things got smokey as well. Not ideal if it’s prolonged or if the bun has a respiratory illness already, but occasional cooking smoke is not generally a problem. Buns are not as sensitive as parrots to smoke etc.
Buns can have heart attacks and strokes just like humans. There are other causes too that even vets don’t fully understand (I had a friend who’s bun died of what can only be described as complete organ failure with no other real cause). One preventable cause to consider is RHDV2, a virus that causes sudden death, often without symptoms. I’m not sure where you live, but it is present in Europe (buns are routinely vaccinated there), Australia, and has been spreading in North America since early 2020. There is a vaccine available now in most US states so if you are considering getting another bun and are in an outbreak area then you should definitely get the new bun vaccinated. You can read about RHDV2 in the USA here: https://rabbit.org/health/rhd/
Again I’m so sorry for your loss, it’s an awful shock to loose a young bunny so suddenly.
(((Binky free Thumper )))
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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.