What is canine parvovirus?

Canine parvovirus, commonly called parvo, is a serious viral infection that spreads rapidly among dogs through direct contact with infected animals or contaminated environments. The virus attacks the intestinal lining and bone marrow, causing severe illness that can be fatal without prompt treatment.

Puppies under four months old and unvaccinated dogs face the highest risk. Young animals have immature immune systems that struggle to fight the infection, making them especially vulnerable. The virus spreads through feces, saliva, and contaminated surfaces, so even indoor puppies can become infected if exposed to the virus on shoes, hands, or food bowls.

Symptoms appear within three to ten days of exposure and include severe vomiting, bloody diarrhea, loss of appetite, lethargy, and fever. Affected dogs rapidly become dehydrated and weak. The condition deteriorates quickly and should always be treated as an emergency. Without veterinary intervention, parvo can lead to septic shock and organ failure.

Treatment focuses on supportive care: intravenous fluids to correct dehydration, medications to manage symptoms, and sometimes blood transfusions if the dog's blood cell count drops critically. Survival rates improve significantly with early intervention. Recovery typically takes seven to ten days if the dog survives the acute phase. Prevention through proper vaccination schedules remains the most effective approach. If your puppy or dog shows signs of parvo, contact an emergency veterinarian immediately.