Horse Fly Control and Welfare | Animal Welfare Hub

Flies cause significant welfare harm to horses through biting, irritation, and disease transmission. Effective integrated fly control reduces suffering without relying solely on chemical treatments.

Key Facts

Horse flies, stable flies, and face flies are the primary species causing welfare harm through biting and irritation
Flies transmit diseases including equine infectious anemia, summer sores, and conjunctivitis
Constant fly irritation causes stress, reduced grazing time, skin damage from stamping and tail swishing, and weight loss
Manure management — regular removal and composting — is the most effective breeding site reduction strategy
Fly rugs, masks, and leg wraps provide physical protection with no chemical exposure

Welfare Considerations

Fly-related welfare harm in horses is pervasive during summer months and significantly underestimated. Horses subjected to heavy fly pressure cannot graze normally — they spend excessive time and energy stamping, shaking, and moving away from flies rather than feeding. Horses with sweet itch or sensitive skin experience additional welfare harm from fly bites. The cumulative daily welfare impact across a long summer season is substantial. Integrated fly management — combining manure management to reduce breeding sites, physical protection, and targeted insecticidal use when needed — provides the most welfare-positive and environmentally responsible approach.

What You Can Do

Remove and compost manure regularly — ideally daily — to reduce fly breeding habitat
Invest in fly rugs, masks, and leg wraps for horses particularly sensitive to fly pressure
Use targeted fly traps and sticky traps around stable and field areas to reduce ambient fly populations
Apply insect repellents as supplementary protection — choose products appropriate for horses and the environment
Time turnout to avoid peak fly activity in the middle of hot summer days