Quite possibly. More common I believe in overweight rabbits and those that suffer stress. I don't know enough about it but I am going to read up on it today.
Poor fella. His deterioration happened so quickly but at least he had everything he needed with him, and wasn't in pain. He drifted off sometime between 1am and 3am this morning.
I still keep thinking about how many of these rabbits would simply have died in their hutches from cancers and the like if the woman hadn't asked for help. Thank goodness it was a different ending for them.