Why could a bunny so healthy die so quickly?

Question
My bunny Oreo was a happy and healthy rabbit as far as i knew. No problems eating,going to the bathroom, or even socializing with us or his sister. I am very upset and hope this is something I had nothing to do with.  Please give me some reasons so I will feel better:(

Answer
Without more information about any symptoms of trouble before Oreo died, I cannot really even begin to make a guess.  Please read:

www.bio.miami.edu/hare/sickbun.html

for some information, and if you can write back with more details, I will try to help.

Without a necropsy/post mortem exam, there is often no way to know for certain the cause of death.  Many different things can  cause a quick illness and seemingly sudden demise, but there are almost always subtle signs of trouble beforehand.

I am very sorry for your loss.

Sincerely,

Dana