Can you give me a little history on Blue?
1) Is he 1 year of age or 1 month?
2) If he's 1 year, has he been fully vaccinated (at least three DHPP puppy shots administered by a vet?)
3) Has he been directly exposed to parvo?
4) How long have you had him?
5) What symptoms are you seeing?
6) When did the symptoms begin?
7) Has a parvo test been done to determine that this is parvo and not something else?
8) When was his last fecal exam performed?
9) Are there other dogs in the home that are not up to date on their annual vaccinations, and/or younger than 8 months of age?
This additional info will help me to give you the most concise answer.