So... Gus' problem could well be congestive heart failure. But it could just as easily be kennel cough, which would make sense since he was just boarded and before doing so, I forgot to renew his vaccine.

We have antibiotics, which can help, and for now we're chalking this up to 'I suck.' Which, though it makes me feel awful for not vaccinating our most fragile guy, is a lot better than 'we lost Gus today.'

So for another day, he remains with us. And I'm grateful, because we do love him so.