Companion Animals

Equine Rain Rot: Welfare and Management

Rain rot, caused by Dermatophilus congolensis, is a common bacterial skin infection in horses causing crusting, hair loss and discomfort, particularly in wet conditions.

Key Facts

Rain rot is caused by Dermatophilus congolensis, an actinomycete that thrives in wet conditions
It causes characteristic matted crusts under which the skin is moist and painful when removed
The back, rump and legs are most commonly affected due to water run-off patterns
Compromised skin from biting insects, wounds or prolonged wet conditions predispose horses to infection

Welfare Considerations

Rain rot causes pain and discomfort from crusting lesions, particularly when tack is applied over affected areas. Secondary bacterial infection can worsen the condition. Welfare priorities include removing crusts gently with medicated shampoo, keeping affected areas dry, ensuring shelter access, treating underlying causes such as insect biting, and using topical or systemic antimicrobials in severe cases.

What You Can Do

Provide adequate shelter to keep horses dry during wet weather
Check horses regularly for early signs of rain rot, especially in wet seasons
Treat affected horses with antimicrobial shampoo and keep tack away from active lesions
Seek veterinary advice if the condition is severe, widespread or failing to resolve