Am at work so will have to keep this brief but just wanted to add my support for anyone nursing a sick bun. I've had many poorly buns over the years and I know how exhausting it can be - emotionally, physically and financially.
Given the (awful) choice of caring for a sick bun or having one pass to Rainbow Bridge suddenly and unexpectedly I would choose the first one as it gives me the chance to spoil the bun with previously forbidden 'naughty' noms and to prepare myself (as much as you ever can) for the time they will die. Having said that, you then have the question of when 'that' decision has to be made, which is a whole separate nightmare.
Sending lots and lots of vibes for all the RU poorly buns and a huge 'well done' to the humans caring for them.