Canine parvovirus causes severe, painful disease and is entirely preventable through vaccination, yet outbreaks persist in under-vaccinated communities.
Parvovirus causes extreme suffering - bloody diarrhoea, vomiting, severe dehydration and intestinal haemorrhage over 3-7 days before death without treatment. The fact that it is entirely preventable by a cheap, effective vaccine makes outbreaks in vulnerable communities a welfare justice issue as much as a veterinary one.