Horse Rain Rot (Dermatophilosis): Prevention and Treatment

Rain rot is a common bacterial skin infection in horses caused by prolonged wet conditions, leading to painful crusting and hair loss that requires prompt treatment and management change.

Key Facts

Rain rot is caused by Dermatophilus congolensis bacteria that penetrate damaged or softened skin
The condition thrives in wet, humid conditions with inadequate grooming or shelter access
Clinical signs include crusted scabs, hair loss, and raised tufts of matted hair along the back and hindquarters
Removing scabs causes pain; softening first with medicated shampoo reduces discomfort during grooming
Treatment involves antibacterial washes and improved shelter and drying management
Horses with compromised immune systems including those with PPID are more susceptible

Welfare Considerations

Rain rot causes significant skin discomfort and, in severe cases, widespread painful lesions that make grooming and saddling painful for affected horses. Repeated wetting and drying cycles without adequate shelter create chronic skin barrier failure. Well-meaning owners who pick off dry scabs without softening first cause avoidable pain. Prevention through providing adequate shelter, regular drying after wet weather, and maintaining skin health is the primary welfare approach. Horses kept in consistent wet conditions without shelter access are at risk of repeated and escalating skin welfare problems.

What You Can Do

Ensure horses have access to adequate shelter from rain and wind throughout wet seasons
Dry horses thoroughly after wet weather, particularly along the back, loins, and hindquarters
Treat active lesions with antibacterial shampoo, allowing it to contact before softening and gently removing scabs
Check immune status of repeatedly affected horses for underlying conditions including PPID
Avoid using shared grooming equipment between affected and unaffected horses to prevent spread