Mulesing — surgical removal of skin folds from merino sheep rear ends — is performed to prevent flystrike but causes acute pain without anesthesia in most cases.
Mulesing without anesthesia causes acute surgical pain followed by prolonged wound healing. The procedure prevents a potentially more severe welfare harm from flystrike, creating a genuine dilemma. However, pain management is available and should be mandatory rather than optional. Non-mulesing alternatives including breed selection toward bare-breech genetics, crutching, and targeted treatment are increasingly viable alternatives to routine mulesing.