This Isn't Going To B e Good News

When I got home from work yesterday morning, I noticed our 15 year old cat was looking not too well. Checked him out, and he was dehydrated. Off to the vet for a little sub-q hydration, and home again. This morning, same deal - dehydrated, sub-q, home again. I have fluids to rehydrate him tomorrow morning, if need be. But I know on some level that this is not going to be good.