Tail docking of dairy cattle is banned in the UK and EU on welfare grounds, though illegal docking persists in some operations, requiring enforcement attention.
Tail docking was historically performed on dairy cows with the claimed benefit of reducing mastitis through cleaner udder environments. This justification has been thoroughly discredited by research showing no mastitis reduction benefit. Cows' tails serve essential functions including fly irritation reduction and social communication between animals. Docked cows show increased restlessness from fly irritation during summer and have lost a behavioral communication tool. The permanent loss of fly control capacity causes ongoing welfare compromise throughout the animal's life particularly during hot fly-active weather. The UK ban reflects the evidence-based conclusion that the practice has no welfare benefit and causes definable welfare harm. Enforcement of the ban requires farm inspections and veterinary vigilance.