Hi April,
I am also confused. You mentioned "biopsy"....I'm assuming that you mean necropsy. How about posting that report? I have seen a lot of things in my many years of having rabbits....and the vast majority of them are special needs...I have seen many different ways in which rabbits died...but never this. I would be very interested in seeing what the lab results were on this rabbit overall....just for my own learning experience. The info might ring a bell with something I have seen previously. Regardless of the cause, it is always a sad day to lose one. Just one little note.....most vets and very very few people know that rabbits do not chew their hay as we expect. They actually do swallow the entire piece of hay usually in one piece. That is why stemmy hay is so good for a slow gut...lots of pushing power. If you watch a rabbit chew....they do not chew like we do in an up and down motion....they chew with more of a side to side motion. The stems of hay are not crushed like we would think...they are folded into something that looks like an accordian (can you tell my age?....bet most young people will have no idea what an accordian is). So in reality, they really do swallow the hay as intact as the stem will allow. I love stemmy hay for my rabbits. If you look at their poops, you will see hay in them from time to time. It will show the basic length of the fold. If the hay were crushed like we crush our food, the acidity in the gut would make fast work of it. In an effort to help us all, if at all possible, please post the findings of the necropsy.
Randy