Companion Animals

Horse Fly and Insect Nuisance Welfare

Fly and insect nuisance causes significant welfare harm to horses through constant irritation, fly-related diseases, and sweet itch; management reduces chronic distress.

Key Facts

Culicoides biting midges cause sweet itch (summer seasonal recurrent dermatitis) in genetically susceptible horses
Sweet itch causes intense pruritus leading to self-traumatization through rubbing
Fly-related conditions include pinkeye (infectious keratoconjunctivitis), rain rot, and wound myiasis
Face masks, fly rugs, and insect repellents reduce fly burden and associated distress
Sweet itch management includes midge-proof rugs, stabling at dawn and dusk, and antihistamines

Welfare Considerations

The constant irritation of flies and biting insects represents a chronic welfare harm for horses during summer months. Sweet itch victims rub until they remove mane, tail, and skin - the distress is visible and severe. Even horses without specific allergies experience behavioral disruption and energy expenditure from constant fly harassment. Active fly management is welfare management.

What You Can Do

Provide fly rugs and face masks during peak fly season for affected horses
Stable horses during dawn and dusk when Culicoides midges are most active for sweet itch sufferers
Use appropriate licensed insect repellents and wipe-on fly sprays
Maintain muck heaps away from grazing areas to reduce breeding sites for flies