Sweet Itch in Horses: Welfare and Management

Sweet itch, or insect bite hypersensitivity, is a chronic allergic skin condition in horses caused by hypersensitivity to Culicoides midge bites, causing intense pruritus and self-trauma that severely impacts quality of life.

Key Facts

Sweet itch affects approximately 5% of the UK horse population
It is caused by an IgE-mediated hypersensitivity response to Culicoides midge saliva
Affected horses rub and scratch affected areas obsessively, causing hair loss and skin lesions
Signs are seasonal, coinciding with midge activity from spring through autumn
Certain breeds including Icelandic horses and Welsh cobs show higher prevalence

Welfare Considerations

Sweet itch causes prolonged and intense suffering during the midge season. Affected horses are unable to escape their hypersensitivity response and may cause severe self-inflicted wounds from continuous rubbing. The chronic nature of the condition means horses may suffer for their entire lives. Management centres on preventing midge bites through appropriate rugging, stable management, and topical treatments. Affected horses require careful management and regular monitoring to prevent skin breakdown.

What You Can Do

Use fine-mesh fly rugs and hoods designed specifically for sweet itch management during midge season
Stable horses during peak midge activity at dawn and dusk
Apply insect repellents regularly and monitor skin condition carefully throughout the season
Work with your vet to develop an individual management and treatment plan for affected horses