We're still giving him a diuretic so it may be another day before he feels its full effects. If it works. The vet took him off of all blood-pressure medications so he may not be feeling well because of that.
But he's purring again (not as loudly or furiously) and slowly walking around. He's still very patient as we syringe-feed him and give him fluids. We are giving him half as much fluid now. This morning, he sat expectably afterward, wondering why it happened so fast.
He's definitely a bit better than he was. That's something.