Sheep Pain Assessment: Recognizing Suffering in a Stoic Species

Sheep are prey animals that naturally mask signs of pain and illness. Developing reliable tools for pain assessment is essential for improving sheep welfare on farms.

Key Facts

Sheep are highly stoic prey animals — showing pain or weakness makes them vulnerable to predators, so natural selection has favored pain concealment.
Human stockpersons consistently underestimate pain in sheep compared to more expressive species like dogs and horses.
The Sheep Pain Facial Action Unit System (SPFACU) has been validated to detect pain through facial expression changes in sheep.
Validated behavioral indicators of sheep pain include reduced movement, altered posture, isolation from the flock, reduced feeding, and changes in vocalisation.
Pain is common in sheep — lameness, surgical procedures (castration, tail docking), lambing, and disease all cause pain that is often inadequately managed.
NSAIDs (meloxicam, ketoprofen, flunixin) are effective analgesics for sheep — their use is increasing but remains far below what welfare evidence supports.
Providing analgesia for routine painful procedures (castration, dehorning, shearing wounds) significantly improves both welfare and outcomes.

Welfare Considerations

The stoicism of sheep makes them particularly vulnerable to unrecognized and untreated pain. Stockpersons who lack training in sheep pain recognition may walk past lame, injured, or post-surgical sheep without recognizing their suffering. Validated pain assessment tools — including facial action unit systems and behavioral scoring — are available but underused on commercial farms. A critical welfare gap is the routine performance of painful procedures (rubber ring castration, tail docking, disbudding) without analgesia, based on the incorrect belief that sheep do not feel pain as acutely as other species. Research clearly demonstrates that sheep experience pain from these procedures and that analgesia reduces behavioral and physiological pain indicators. Training stockpersons in sheep pain recognition is one of the highest-impact welfare interventions available.

What You Can Do

Ensure all painful procedures on sheep (castration, tail docking, dehorning) are performed with appropriate analgesia.
Train yourself and your team in validated sheep pain assessment using facial and behavioral indicators.
Implement a daily health check protocol that specifically assesses pain indicators in your flock.
Work with your vet to develop a flock health plan that includes pain management protocols for common conditions.
Support research into improved sheep pain assessment tools that are practical for commercial farm use.
Advocate for mandatory analgesia requirements for painful procedures in sheep in your country's animal welfare legislation.