Rain Scald in Horses: Prevention and Welfare

Rain scald, caused by Dermatophilus congolensis, is a bacterial skin condition triggered by prolonged wet conditions and compromised skin barrier, causing painful lesions and welfare issues in horses kept outdoors.

Key Facts

Dermatophilus congolensis is a gram-positive actinomycete that penetrates skin damaged by prolonged moisture
Characteristic matted hair with crusted lesions develop on the back, rump, and neck
Horses with poor natural shelter or inadequate rugging are at highest risk
The condition is more common in autumn and winter when rainfall is highest
Treatment involves removing crusts, topical antiseptics, and improving management to allow drying

Welfare Considerations

Rain scald causes painful skin lesions that are tender to touch and can become extensive in severe cases, covering large areas of the back and quarters. The removal of matted hair crusts during treatment causes acute discomfort. Horses kept in exposed, wet paddocks without adequate shelter or appropriate rugging face a preventable welfare burden. Young horses, aged horses, and those in compromised body condition are at highest risk. Simple management changes including shelter provision and appropriate turnout rugs substantially reduce incidence.

What You Can Do

Ensure all horses have access to effective field shelter to allow skin drying during wet periods
Use appropriate turnout rugs to protect susceptible horses in wet conditions
Monitor skin condition regularly under rugs and seek veterinary treatment for developing lesions
Improve drainage in paddocks and winter management areas to reduce chronic wet conditions