here you can read up on it here
http://en.wikipedia.org/wiki/Canine_parvovirus
but from my experience i think they'll be fine..but if they start having any diarrhea, vomiting, inappetince i would take them to the vet asap the sooner the better their chances ive seen tons of parvo dogs even tiny puppies and they do fine when caught on time..but just in case clean everything real good with bleach and water...parvo can live a
longtime i hope this helps