i found one of my does much like you describe this morning...
she was perfectly fine when i checked on her last night, eaten no problem but ot drank much yesterday...this morning go out to feed and she was dead, on her side, straight with her legs stretched straight out and her head back.
I skined and opend her up to see if i could find any kind of signs of illness because it was so sudden, but heart, lungs, liver, kidneys, stomach and intestines all looked normal, bladder was empty.
nose, butt, eyes and ears all perfectly clear and shed showed no signs of illness...
Worse was shes was a week away from delivering 6 kits (counted them when i necorpsied her) so sad, so frustrating but the only conclusion i can come to is something spooked her and either her little heart gave out or she jumped/twisted funny and broke her neck...internally there was NO signs of illness, no blockage, normal poop ect...
from what i was told when i got her she was 3 yrs old.
Im REALY upset to not only loose her but loose her entire litter too only a week away from due date...but rabbits arnt exactly built to handle "stress" so mabe a similar situation?!
Ill be keeping a very close eye on my buns over the next couple of weeks incase it was something...but ugh.
i think the worst part is not knowing...
I opend her up in hopes of finding something obvious, a tumor, funky organs...something...but finding nothing has now left me with the "what ifs" and "what could have happends".
*sigh*
like you im pretty particular about feed so i know its not that, and no signs of attempt to get into her hutch so i just dont know.
sorry about your loss...its never easy to loose one.