reading this i thought that it was the parvo virus also, my dog-olas, caught it when she was just 2 months old and it cost me about 2 grand to nurse her back to health. it sounds like you caught it early enough and got him treatment fast, koa will make it through and be stronger than ever. i know how taxing all this is, both mentally and financially, my heart goes out to you and to koa, glad to see things are turning for the better.
im sure the vet will tell you everything to do in order to help him recover as fast as possible once he gets home. feeding an organic diet was the best thing for my olas. i just made her boiled chicken and brown rice for the first couple weeks when she got back from the vet until her stomach got stronger. there are some great online resources for holistic/organic pet diets.
I’m sure that you are besides yourself with happiness … really happy to know that your friend is on a path out of the woods … I know what it feels like … I/We all lost a “great” one a couple years back … you might remember … he’s shoulders were at your waist … I miss him … Be good … have fun !!! SB