Tail docking in pigs is performed to prevent tail biting — a serious welfare problem in intensive systems. The EU has sought to ban routine tail docking by addressing root causes instead.
The pig tail docking debate is a microcosm of a broader welfare challenge: managing the symptoms of poor welfare rather than addressing the causes. Tail biting emerges from the same barren, overcrowded, understimulating conditions that cause a range of other welfare problems — it is a signal that something is fundamentally wrong in the system. Routine tail docking — cutting off the tail's sensitive end — causes acute pain during the procedure and chronic pain from the resulting wound; it does not address why biting occurs. The EU's approach of seeking to eliminate docking by addressing root causes — enrichment, stocking density, ventilation, nutrition — is welfare-superior but requires investment in better facilities. The clear lesson from countries that have succeeded in eliminating both tail biting and docking is that the root-cause approach works when properly implemented.