Routine tail docking of piglets without anesthesia is performed to prevent tail biting in intensive systems but causes acute pain and prevents expression of the normal behavioral repertoire without addressing root causes.
Tail docking illustrates a recurring pattern in farm animal welfare: an industrial practice that causes clear welfare harm is justified by preventing another welfare harm (tail biting) that is itself caused by the welfare-compromising conditions of intensive production. The acute pain of tail docking without anesthesia is well-documented — piglets show behavioral and physiological distress indicators during and after the procedure. Docking treats a symptom (tail vulnerability) rather than the cause (barren, overcrowded environments that create biting behavior). Evidence from intact-tailed pig production with appropriate enrichment demonstrates that the underlying assumption — that docking is necessary — is false when management addresses root causes. This evidence base supports regulatory approaches that require both prohibition of routine docking and improvement of housing conditions that make docking seem necessary.