Babesia and other blood parasites cause potentially fatal haemolytic anaemia in dogs, and are emerging threats in the UK from tick imports and climate-related tick range expansion.
Babesiosis causes acute, severe welfare suffering through profound haemolytic anaemia — cells destruction producing jaundice, severe weakness, and cardiovascular compromise. Dogs deteriorate rapidly and may die within days without treatment. The welfare significance for UK dog owners is the need to suspect blood parasite disease in dogs returning from continental travel with fever and pale gums, and to communicate this travel history to attending vets who might otherwise not consider babesiosis as a differential. Tick prevention before, during, and after travel, and thorough tick checking within 24 hours of travel, are the primary welfare prevention measures. Reporting confirmed cases to APHA supports UK disease surveillance.