Equine Sweet Itch: Advanced Welfare Management in Severely Affected Horses

Sweet itch (insect bite hypersensitivity) is a severely welfare-compromising allergic skin condition in horses caused by hypersensitivity to Culicoides midge saliva, requiring intensive management in severely affected animals.

Key Facts

Sweet itch affects an estimated 3-5% of the UK horse population and up to 60% in some native breeds
Icelandic horses and native British breeds such as Shetland ponies are particularly predisposed
Affected horses rub intensely causing hair loss, skin damage, and secondary infection
Culicoides midges are most active at dawn and dusk from spring to autumn
No curative treatment exists but symptom management and midge avoidance significantly improve welfare

Welfare Considerations

Severe sweet itch causes intense pruritis, self-mutilation through rubbing, and secondary skin infection that profoundly compromises welfare throughout the midge season. The frustration of unrelievable itch causes significant negative affective states and behavioural changes including increased aggression. Severely affected horses may rub continuously causing open wounds and blood loss. Comprehensive management combining sweet itch rugs, midge-proof stabling from dusk to dawn, topical treatments, and veterinary management of secondary infections is required to achieve acceptable welfare outcomes in severe cases.

What You Can Do

Stable affected horses from dusk to dawn during midge season to reduce Culicoides exposure
Use sweet itch rugs covering the mane, withers, belly, and tail base throughout the midge season
Apply permethrin-based repellents regularly to exposed skin areas
Seek veterinary treatment for secondary skin infection promptly to prevent welfare escalation
Consider allergy testing and immunotherapy for severely affected horses where available