Canine parvovirus is a highly contagious, often fatal viral disease that causes severe gastrointestinal suffering. It is almost entirely preventable through vaccination but continues to kill thousands of unvaccinated dogs annually.
Canine parvovirus causes one of the most severe and prolonged welfare harms in companion animal medicine — days to weeks of unrelenting vomiting, haemorrhagic diarrhoea, dehydration, and systemic sepsis. Dogs that survive intensive care often lose 20-30% of body weight during treatment. The welfare tragedy is that virtually all cases are preventable through a vaccine that costs a fraction of treatment. Welfare cost from vaccine hesitancy or non-compliance falls entirely on the animal — unvaccinated dogs in areas of parvo prevalence face significant risk of an avoidable, suffering-filled illness. Shelter populations are particularly vulnerable; vaccination on intake and appropriate isolation protocols are essential welfare interventions.