Canine parvovirus causes severe and often fatal haemorrhagic gastroenteritis; vaccination is highly effective and preventing outbreaks is a welfare priority.
Parvoviral enteritis causes intense suffering — vomiting, bloody diarrhoea, severe dehydration, pain, and septic shock develop rapidly over 24-72 hours. Puppies are most severely affected, and their distress during the acute phase is profound. Intensive hospitalised treatment requires IV fluids, anti-emetics, antibiotics, pain relief, nutritional support, and isolation nursing — a significant burden on both the animal and the owner. Vaccination prevention is overwhelmingly more humane than treatment. Welfare gaps arise in under-vaccinated communities where outbreaks occur, and in facilities housing unvaccinated puppies. Ensuring vaccine access in lower-income communities is an important public animal welfare intervention.