This condition is characterized by severe bloody diarrhea, with or without vomiting. (soonervet.net)
This causes severe bloody diarrhea that rapidly dehydrates your puppy's developing body. (smartdogowners.com)
Parvovirus can cause respiratory and / or heart failure but the most common symptom associated with parvo is the intestinal form which causes vomiting with severe bloody diarrhea. (thedogplace.org)