I don't want to play blame the vet game here but he should have done a parvo test the first visit. They're not that expensive and early treatment increases their odds of survival by quite a bit.
YOu might try having lick some non-fat yorgurt or cottage cheese off a plate. Smear it out so that he can't gulp it and upset his tummy. Good luck.
Poor baby. I would keep him on his old food for a week and then start mixing the old (75% with the new 25%). Water is fine for today and then slowely start his old food a little at a time. Some do chicken and rice but personally I find the old food is better and not to start switching till he gets over this. This happens more often than you think. Everytime in his life you will need to switch the foods slowely over the coarse of at least a week or longer.
Feel better soon Roscoe! PS...so your worried parents can feel better also:)
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