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Rabbits get many diseases...are there any clinical signs you can tell me about...like sneezing? diarrhea? no defecation?
Hairball issues can cause death when it cause obstruction. The urinating is concerning as well. Unfortunately when they are outside, you are not able to watch their feces production closely so it may have been hairballs.
I am sorry for your loss.
There is a mixed irony with that isn't there??
Well good luck...and hopefully it won't discourage you from future rabbits!