Once the dog has been exposed to the Parvo Virus the symptoms of Parvo usually show up within 5 to 10 days.
It's important to get the dog to the vet if possible as soon as you can so the Parvo can be treated.
When your dog has Parvo you may notice bloody diarrhea, Vomiting, Lethargy, Fever, Weight Loss, Anorexia, Dehydration and weakness.