Tail biting is one of the most serious and preventable welfare problems in pig farming, caused by barren environments and management failures rather than innate aggression.
Tail biting causes direct welfare harm to victims through pain, blood loss, infection, and in severe cases spinal abscess formation. Pigs being bitten experience significant distress and ongoing pain. The behaviour itself is a welfare indicator — it only emerges at high rates in environments that chronically fail to meet pigs' behavioural needs. Tail docking, the routine response, is itself a welfare harm — it causes acute pain and prevents pigs from expressing normal tail-waving social signals. Addressing the root cause through environmental enrichment is both more welfare-positive and, evidence shows, more effective at preventing outbreaks. Farms with high-quality enrichment programmes have significantly lower tail biting rates without routine docking.