you can feed them pedialite but the best thing you can do is keep them hospitalized. Also if you cant afford to have them hospitalized, there is a product that will help your dog fight against the parvo virus. My Girlfriends little Yorkie was sick with parvo so i called Amber Technology which is an all natural Nutraceutical company. These guys have a product that works on Parvo! my dog was up and running within three days his stools hardened, stopped vomiting, and had energy! so if you are looking for a product that prevents parvo contact Amber Technology.