© Ray Miller
Thrush is a fungal or bacterial infection that attacks the frog of the foot. It is a degenerative condition that, if caught in its early stages is easily managed, but can become quite severe. The fungus or bacteria exists in the clefts on either side of the frog, and horses with long toes and contracted heels tend to develop deep frog clefts and are particularly susceptible.
The prevailing symptom of thrush is the accumulation of a black, foul-smelling, moist material. This discharge drains from the side grooves of the frog. Early on the horse is sound, but left untreated, the condition will progress until lameness appears. This occurs when the infection destroys the horn of the frog and extends into the sensitive tissues.
Poor foot care and unsanitary conditions are the causes of thrush in the horse. When the animal is left standing in dirty, moist conditions and the feet are not cleaned regularly, the infection will flourish. Conscientious stable management will eliminate these conditions.
Treating thrush is a simple procedure. Thoroughly clean the foot - particularly the frog area - and then treat daily with a basic bleach and water mixture. If the frog itself is damaged, all loose and dead tissue must be trimmed away. The feet must then be cleaned every day to remove dirt and manure, and the horse should stand on a clean, dry bed. Prevention is even simpler. Maintain good hoof care and hygiene and have a qualified farrier keep the foot properly trimmed and shaped.
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