Canine parvovirus causes severe, painful gastrointestinal disease with high mortality in unvaccinated puppies, and vaccination is one of the most welfare-impactful preventive health interventions available.
Canine parvovirus causes one of the most severe welfare emergencies in companion animal medicine. Affected puppies experience acute haemorrhagic gastroenteritis, profound dehydration, extreme weakness, and systemic sepsis over a period of days. Survival with intensive treatment is possible but not guaranteed, and the suffering during illness is extreme. Prevention through vaccination is highly effective, inexpensive relative to treatment costs, and without significant welfare cost to the individual. The welfare argument for vaccination is among the clearest in veterinary preventive medicine — a brief, low-stress intervention prevents a disease that causes severe, prolonged suffering and carries high mortality. Barriers to vaccination including cost and access are the primary reasons for preventable parvovirus welfare failures.