Your 12-week-old Labrador puppy, Luna, has had bloody diarrhea for 12 hours. She's lethargic, won't eat, and has vomited twice. She's had only one vaccination so far. The diarrhea is liquid, foul-smelling, and bright red. You're terrified it's parvo.
Warning: Parvovirus is highly contagious and life-threatening in puppies. Mortality without treatment approaches 90%. Dehydration and septic shock can kill within 24–72 hours. Seek veterinary care immediately. Isolate from other dogs.
In-clinic fecal antigen tests detect CPV-2 with high sensitivity. A positive test in an unvaccinated puppy with compatible signs is diagnostic. CBC often shows severe leukopenia (low white blood cells)—a poor prognostic sign. The Triage/Emergency Specialist flags this as an emergency: Unvaccinated puppy with hemorrhagic diarrhea—parvovirus suspected. Seek emergency care now.
Parvo puppies lose massive fluid through vomiting and diarrhea. Dehydration of 8–12% is common. IV fluid therapy corrects deficits, maintains perfusion, and supports organ function. The Fluid Therapy Calculator helps calculate maintenance plus deficit. The Vital Signs Reference provides normal puppy parameters—tachycardia, prolonged CRT, and tacky gums indicate shock.
Hospitalization with IV fluids, antiemetics, antibiotics (secondary bacterial translocation), and supportive care. With aggressive treatment, survival is 80–90%. Without treatment, mortality is high. Isolation is essential—parvo is shed in feces and is highly contagious to other dogs.
Use Triage/Emergency Specialist for urgency, Vital Signs Reference for shock parameters, and Fluid Therapy Calculator for educational fluid calculations.
- Unvaccinated puppy + bloody diarrhea = parvo until proven otherwise.
- Rapid in-clinic test confirms diagnosis in minutes.
- IV fluid therapy is the cornerstone of treatment.
- Isolate from other dogs—parvo is highly contagious.
- Complete vaccine series prevents parvo—don't skip boosters.