Another update! 48 hours after going off Albon his energy levels spiked, he is not lethargic anymore, he is getting up and playing and running around the house. He is eating fine, he got fluids the past few days so he is definitely hydrated for now. He is also drinking water, sometimes I think maybe a little much at once. His stools are soft but no longer "diarrhea". He has not vomited since Wednesday 9/23. His temperature has been fine, no fever. I did notice his belly is starting to swell. He did test positive for coccidia and was on Albon for 4 days, which made him feel horrible (liquid diarrhea, vomiting, lethargy), and the vet said that should have done the trick for the parasites. He seems to be fine, walking fine, grooming fine, sleeping normal amounts of time for his age. His coat is starting to look better. Vet said possible panleukopenia or FIP but I'm just not sure with his normal eating/drinking fine; and the fact he has a lot of energy and is playing quite often now.