Sweet Itch in Horses: Management and Welfare

Sweet itch is a severe allergic skin condition in horses caused by sensitivity to midge bites. It causes intense suffering and requires diligent management to protect affected horses.

Key Facts

Sweet itch (summer seasonal recurrent dermatitis) affects approximately 3-5% of horses in the UK
It is caused by hypersensitivity to the saliva of Culicoides midges
Affected horses show intense itching, hair loss, skin thickening along the mane, tail, and belly
The condition worsens year on year as sensitization increases
Management is primarily preventive — reducing midge exposure dramatically reduces suffering
There is currently no cure, making lifelong management necessary for affected horses

Welfare Considerations

Sweet itch causes intense, persistent pruritus that drives self-traumatic rubbing behavior — horses rub against fences, trees, and buildings until they bleed. The chronic nature of the condition causes significant psychological distress as well as physical damage. Management requires keeping horses indoors at dawn and dusk when midges are most active, applying full-body sweet itch rugs, using insect repellents, and avoiding midge-prone environments like water bodies. Immunotherapy shows promise but is not widely available. Without appropriate management, affected horses suffer continuously throughout the summer.

What You Can Do

Implement rigorous midge avoidance measures for affected horses from spring onward
Use properly fitted sweet itch rugs that cover the mane and tail base
Stable horses during high-midge periods (dawn, dusk, and calm warm evenings)
Work with your vet on pharmacological management for severe cases
Consider immunotherapy options if available in your region