Hobkin's appetite is still way down, which is worrisome but totally understandable. However, I've been able to coax him to munch a few mealworms or crickets or peanuts throughout the night, and he's readily taking his meds infused in whipped cream. I also just administered 150ml of subcutaneous fluids to him, so he should be hydrated.
The so-good-I'm-trying-not-to-overreact news is that I think his breathing is back to normal. Possibly a little harder than usual, but so much better than Friday night/Saturday morning that it's nearly unbelievable. He has started having sneezing/coughing fits—little bursts of 5-7 sneezes/coughs in a row—which I don't know how to feel about. Is he just clearing the last fluid from his lungs? Or is it indicative of a problem? As long as he's breathing well and seems comfortable, not going to fret about it and will bring it up with the vet tomorrow. Also been gradually dialing down the oxygen throughout the night from 4 liters/minute to 1 liter/minute.
What I am really worried about is that he suddenly started displaying severe hind leg weakness last night to the point where he can barely walk a couple steps without flopping or wobbling over. He's a senior skunk and this has been very hard on him, and he already suffers from arthritis, but this looks like what some of our ferrets experienced when they had cancer. Not a lot I can do about it right now since our total focus must be on getting him over his pneumonia, but it's worrisome.