The Sheep Pain Facial Action Units (SPFAU) scale provides a validated tool for assessing pain in sheep without requiring invasive testing. Understanding and using this tool improves welfare outcomes in farm and veterinary settings.
The development of validated pain assessment tools for sheep represents a significant welfare advance. Historically, pain in farm animals was often unrecognised or undertreated because signs were subtle and difficult to interpret without training. Grimace scales translate the complex physiological changes of pain into observable, scorable facial features that can be assessed quickly and reliably. The welfare impact extends beyond individual animals - when pain is better recognised and treated across a flock, the cumulative reduction in suffering is substantial. Training farmers and farm vets to use these tools, and incorporating them into welfare auditing, is an achievable improvement that could benefit millions of sheep annually.