Horse Sweet Itch and Insect Control Welfare

Sweet itch is an intensely itchy allergic skin condition in horses caused by insect bites, causing significant chronic suffering without appropriate management.

Key Facts

Sweet itch affects up to 5% of horses in the UK, caused by hypersensitivity to Culicoides midge bites
Affected horses rub themselves raw, causing hair loss, wounds and secondary infection
The condition is lifelong — there is no cure, only management
Full-body fly rugs and insect-repellent products significantly reduce exposure and suffering
Stable management during dawn and dusk when midges are most active reduces exposure

Welfare Considerations

Sweet itch causes intense pruritus that severely impacts quality of life. Horses rub against any available surface, causing self-inflicted wounds. The itch-scratch cycle is self-perpetuating and distressing. Without management, affected horses lose condition, become reactive and unpredictable from discomfort, and develop chronic skin changes. Management requires a combination of fly rug use throughout the midge season, insect repellents, housing during peak midge activity and antihistamines or corticosteroids for acute flares. Owners of affected horses need clear, evidence-based guidance on the full range of management options.

What You Can Do

Fit affected horses with full-coverage fly rugs from spring through autumn
House sweet itch horses in insect-proof stabling during dawn and dusk peak midge times
Apply insect repellent regularly and check effectiveness of specific products
Ask your vet about immunotherapy for severe sweet itch cases