First aid for horses in a bottle. This natural tea tree spray from Horsewise soothes minor cuts, scrapes and bites. Brilliant throughout the year for skin irritations such as sweet itch, mud fever and rain scald. It is formulated with 100% tea tree oil and is effective on skin irritated by flies and midges, as well as controlling reactions to micro-organisms found in mud. Also effective against rain scald and midge related irritations.