Companion Animals

Rain Rot (Dermatophilosis) in Horses: Welfare and Treatment

Welfare guide to rain rot -- a common bacterial skin infection causing significant discomfort in horses.

Key Facts

Rain rot (dermatophilosis) is caused by the bacterium Dermatophilus congolensis
It thrives in wet humid conditions -- prolonged turnout in wet weather is a primary risk factor
Lesions appear as matted clumps of hair with crusts that pull away to reveal raw skin beneath
The condition causes significant skin discomfort -- horses often resent grooming over affected areas
Horses with compromised skin from wounds or insect bites are more susceptible
Treatment involves removal of crusts softened with antibacterial wash and medicated shampoos
Severe cases may require systemic antibiotics when deep infection is present
Prevention includes adequate shelter, waterproof rugging in wet conditions, and prompt drying of wet coats

Welfare Significance

Rain rot causes real skin pain -- the raw inflamed tissue exposed when crusts are removed is sensitive, and grooming over affected areas is distressing for horses. Preventing the condition through shelter provision and appropriate rugging is more welfare-protective than treating established infection. Prompt treatment prevents spread and secondary infection.

What You Can Do

Ensure horses have access to adequate shelter during prolonged wet weather
Use appropriate waterproof rugs for horses that are susceptible to skin conditions
Check horses regularly in wet conditions -- early detection prevents severe infection
Use medicated antibacterial wash and remove crusts gently after softening with warm water