Canine parvovirus (CPV) is one of the most dangerous infectious diseases affecting dogs, causing severe haemorrhagic gastroenteritis with high mortality in unvaccinated animals. It remains a major welfare crisis in communities with low vaccination coverage.
CPV causes extreme suffering: the haemorrhagic diarrhoea, vomiting, abdominal pain, and sepsis produce a state of intense acute distress. Affected puppies deteriorate rapidly, and without intensive care — which is expensive and requires 24-hour monitoring — most die. The welfare inequity here is stark: vaccinated dogs in high-income households are almost completely protected, while dogs in unvaccinated populations face devastating outbreaks. Communities without affordable veterinary access lose puppies to a preventable disease. Shelter CPV outbreaks are welfare crises that require immediate isolation protocols, staff protection, and difficult euthanasia decisions for animals too ill to survive. Prevention through vaccination is overwhelmingly the most welfare-positive and cost-effective approach.