That is strange, definitely worth getting tested for. Mine's legs just got weak, they got off balance, and then we had to put them out of their misery because they couldn't get to food and water. I'm kinda scared they'll come back with the report of death as "broken neck". I wrote in the paperwork that all that had it had to be culled, so I think they'll know. What I was worried about was their symptoms matched no diseases that I researched. All of them that sounded similar were diseases they could get under a certain age, and they were already past it.