I won't bore you with my experiences with parvo cause they could fill a book. The vet I worked for really hated me and wanted me to quit so I got all of the euthanasias and all of the quarantine work. Anyway...It really depends on the dog, how old when the disease was contracted, the amount of scarring in the intestine, etc. You can have them that seem to be not all that sick and they can have incredible scarring. Also, if the pup has already been exposed and the virus is in incubation, a vaccination isn't going to mean a hill of beans. Bleach doesn't kill anything btw. Especially not parvo. Lysol or nolvasan does though. Nolvasan will kill anything and is available through your local feed store like Tractor Supply or feed co-op. There's a few other products out there that will also kill it but they are very expensive for the amount you need.
Parvo will last for up to a year unless killed by a virucidal. Period. You can bring it in/out on your shoes, hands, clothes, etc. You can add nolvasan to your wash water and make a "shoe bath" that you have to step into....someth ing like a dishpan. I pay about $32 for a gallon and it lasts a really long time.
Anyway, back to the original question. If the pup had early, competent intervention then usually, yes they bounce back and are fine. The earlier the better.
