Routine tail docking of piglets without anesthesia is practiced in many countries to prevent tail-biting in overcrowded conditions, treating a symptom rather than the welfare problem that causes it.
Tail docking addresses a symptom — tail-biting — while leaving the underlying welfare problems of overcrowding and boredom unaddressed. The procedure causes acute pain, and neuromas at the docking site may cause chronic pain. Pigs in enriched, adequately spaced environments do not show the tail-biting that prompts docking, demonstrating that the procedure is a welfare shortcut rather than a necessity. Countries that have successfully phased it out show that the commercial pig industry can operate without routine docking.