Horse Seedy Toe and White Line Disease

White line disease and seedy toe cause internal hoof wall damage that can lead to significant lameness if not identified and treated appropriately.

Key Facts

White line disease (seedy toe) involves fungal and bacterial invasion of the laminar junction between hoof wall and sole
It appears as a grey or black crumbly material at the white line and can undermine significant areas of hoof wall
Wet, muddy conditions and poor hoof hygiene create conditions for opportunistic pathogen entry
Horses with white line disease may not be immediately lame but develop lameness as undermining progresses
Treatment involves resection of undermined hoof wall by a skilled farrier, followed by antifungal treatment
Prevention through regular farriery and good hoof hygiene reduces incidence significantly

Welfare Considerations

White line disease causes welfare harm through the progressive undermining of hoof wall integrity that eventually causes lameness and, in severe cases, hoof wall separation that compromises the structural integrity of the foot. The insidious onset - beginning as a cosmetic finding on routine inspection before causing pain - means early detection depends on thorough farriery examination rather than owner observation. Once significant undermining has occurred, resection of affected hoof wall is painful and requires skilled management to maintain structural integrity during healing. Regular farriery with thorough sole and white line examination is the most effective welfare intervention - detection and treatment of early disease prevents the welfare harm of advanced infection.

What You Can Do

Schedule regular farriery every 6-8 weeks and ask your farrier to specifically examine the white line
Keep hooves clean and dry where possible - remove impacted mud and debris after turnout
Check hooves regularly between farriery visits for grey/black discoloration at the white line
Seek prompt farriery treatment when white line disease is identified - early intervention prevents progression
Apply antifungal or antiseptic solutions to affected areas as directed by your farrier or veterinarian
Improve drainage in paddocks and stable areas to reduce the wet conditions that favour white line disease