Companion Animals

Horse Sweet Itch: Management of Allergic Skin Disease

Sweet itch affects many horses in the UK causing intense pruritus, self-trauma, and chronic suffering. Evidence-based management reduces suffering for affected horses.

Key Facts

Sweet itch is caused by hypersensitivity to Culicoides midge bites
Affected horses develop intense pruritus causing rubbing, hair loss, and open wounds
Symptoms occur seasonally - typically April to November in the UK
Barrier rugs with fine mesh hoods prevent midge access and significantly reduce symptoms
Stabling during peak midge activity (dawn, dusk, and still evenings) reduces exposure
Desensitisation injections show limited but some evidence of benefit in trials

Welfare Considerations

Sweet itch causes extreme chronic suffering for sensitised horses. The pruritus is intense enough that horses rub themselves raw, causing open wounds and secondary infection. Severely affected horses may become impossible to ride due to pain and restlessness. Barrier protection through sweet itch rugs dramatically reduces symptoms and is the most evidence-supported management approach. Affected horses require lifelong management as the allergy does not resolve with age.

What You Can Do

Fit sweet itch rugs from April before symptoms develop to prevent sensitisation
Stable horses during peak Culicoides activity at dawn, dusk, and still evenings
Discuss antihistamine and steroid options with your vet for acute flare management