Companion Animals

Sweet Itch in Horses: Welfare and Long-Term Management

Welfare guide to equine sweet itch (insect bite hypersensitivity) -- a common, distressing allergic skin disease.

Key Facts

Sweet itch affects an estimated 5% of UK horses and is caused by hypersensitivity to Culicoides midge bites
Clinical signs include intense pruritus along the mane, tail, and belly leading to self-trauma and hair loss
Affected horses may rub continuously causing open wounds, skin thickening, and secondary infections
The condition is seasonal -- worsening during midge season from April to October
There is no cure -- management focuses on reducing midge exposure and controlling itch
Specialist rugs covering the entire body including belly and head significantly reduce midge access
Antihistamines and corticosteroids provide short-term itch relief during severe episodes
Immunotherapy (desensitisation) is being developed and shows promise for long-term management

Welfare Significance

Sweet itch causes intense, persistent pruritus that dominates the welfare of affected horses for the entire midge season. The compulsive rubbing causes significant secondary skin damage and the psychological frustration of unrelievable itch is a real welfare burden. Comprehensive management -- rug coverage, stabling at peak midge times, and medical treatment -- dramatically reduces the welfare impact.

What You Can Do

Use a specialist sweet itch rug that covers belly and head from April to October
Stable affected horses during peak midge activity -- dawn and dusk in summer
Apply insect repellent to exposed skin areas during turnout
Discuss immunotherapy options with a veterinary dermatologist for severe or refractory cases