Tail docking of piglets is a routine but painful welfare compromise performed to prevent tail biting, with evidence that management improvements can prevent tail biting without routine docking.
Pig tail docking welfare illustrates the tension between preventing one welfare harm (tail biting) by causing another (docking pain). Tail docking of piglets at a few days of age causes acute pain - piglets vocalise during the procedure and show pain behaviour afterwards. The justification for docking is that it prevents tail biting, a damaging behaviour in which pigs bite and injure each other's tails in ways that cause severe welfare harm including infection and mortality. The management approach to preventing tail biting without docking requires addressing the underlying causes: high stocking density, inadequate enrichment, health problems that reduce overall resilience, and poor air quality that increases irritability. Countries that have successfully eliminated routine tail docking have done so through mandatory adequate enrichment provision and careful attention to the risk factors that predispose pig groups to tail biting. The failure to eliminate routine tail docking in the UK despite its legal restriction reflects enforcement challenges and the practical difficulty of managing the tail biting risk in intensive systems where underlying causes are structural. The welfare goal should be addressing the root causes of tail biting rather than pre-emptively removing the target.