Sweet itch is an allergic skin condition which is frequently encountered in the UK horse population. It commonly affects British native pony breeds, heavy horses and other European native breeds (e.g. Haflinger, Icelandic, Friesian and Fjords), but can affect any horse or pony. As many as 1 in 20 horses may be affected and there is no known cure.
The disease is caused by hypersensitivity to the bites of the Cullicoides midge which produces skin irritation. Affected horses will scratch...