Personally, I'd ask, but I've got an abrasive personality and offending people doesn't bother me as much as it should. It would be a good thing for you to know if it is a reoccurring issue, especially if you planned on buying more rabbits. I'd keep feeding the critical care food until the issue is solved, which is hopefully very soon. I'm new to rabbits, but a veteran when it comes to pets in general. Just make sure he eats and drinks, and his health doesn't deteriorate.