My suggestion? Some shelters (private) will do care for illnesses at a very reduced cost. If your dog actually has parvo (diagnosed at your vets office) they can typically give you an estimate for home care (SQ fluids and meds for at home rather than the list of things they do in a hospital). Credit cards, care credit and other such sources can be used for payment, if your clinic does not do payment plans (and most don’t because, though we hate to think of it this way, the vet office is a buisness and they have to be able to pay thier bills and staff too).

And as much as no one ever likes to say it, you can surrender your pet. There are many much better options than trying to treat a disease at home without actual knowledge of veterinary medicine.