Canine parvovirus remains a major cause of severe and fatal disease in unvaccinated dogs, causing profound welfare harm from haemorrhagic gastroenteritis and sepsis that is entirely preventable by vaccination.
Canine parvovirus causes severe acute suffering through profuse haemorrhagic diarrhoea, vomiting, dehydration, septic shock, and immune collapse. Affected puppies deteriorate rapidly over 3-5 days, experiencing intense pain, nausea, weakness, and fear in an unfamiliar veterinary environment. Intensive care with intravenous fluids, antimicrobials, and antiemetics significantly reduces mortality but cannot prevent extensive suffering even in survivors. The condition is entirely preventable by vaccination — the welfare case for universal puppy vaccination and maintaining adult booster programmes is absolute.