Tail docking of piglets to prevent tail biting is practiced widely in intensive pig production, but is both a welfare harm itself and a symptom of conditions that cause the underlying problem of redirected aggression and biting.
Tail docking illustrates how welfare interventions can mask rather than resolve the underlying welfare problem. Docking prevents the most severe injury outcomes of tail biting, but tail biting itself continues in docked pigs at the same underlying rate — it is simply less visible because there is less tail to bite. The welfare harm of docking is immediate and real: neonatal piglets have tails with sensory nerve endings whose cutting causes pain and potential chronic sensitisation. The welfare harm of the conditions that cause tail biting — frustration, crowding, inadequate enrichment — is chronic and pervasive. Reform requires addressing both: reducing routine docking through regulation and eliminating the underlying management causes through system change. The evidence from countries that have successfully maintained low docking rates demonstrates that it is achievable within viable farming systems.