Here is some genuinely good news about parvo, with a catch attached. A new study that tracked nearly 79,000 dogs at Banfield veterinary hospitals found that parvovirus diagnoses fell by more than 85% between 2010 and 2022.
The catch is what happened to the dogs who still got sick. Close to 44% of dogs with known outcomes died or were euthanized within 14 days of diagnosis, according to the study published in the Journal of the American Veterinary Medical Association. The researchers describe it as the largest parvo database reported to date, and its message is blunt: the virus has not gone away.
Two details stand out for owners. Puppies between 8 and 16 weeks old made up nearly half of all cases, and the average age at diagnosis actually dropped over the study period, from 17 weeks in 2010 to 14 weeks in 2022. Cases peaked from April through June. And while annual incidence fell from 45.2 cases per 10,000 dogs in 2010 to 6.5 in 2022, more than 2,000 dogs were still diagnosed in 2022 alone.
The most frustrating number is this one: vaccination history was undocumented for more than 90% of the sick dogs. That is not proof they skipped their shots, but parvo is a vaccine preventable disease, and nearly every dog in the study arrived without a confirmed record of protection.
What this means for your dog: take the win, keep the schedule. Puppies still need the full series of core vaccines, and adult dogs need boosters on the timeline your vet recommends. If your pup goes lethargic, starts vomiting, or passes diarrhea that turns bloody, treat it as an emergency. Parvo moves fast, and early treatment is the difference maker. dvm360’s writeup of the study has more detail.