If you have not gone to college yet, get all the education you can in your field so you are tops and can make more money- to spend on horses, of course :)
Prevention- make sure your stable has good fencing, has good arena footing, has attentive owners that actually watch your horse.
FLY SPRAY- feed your horse garlic for an inside out treatment and also use vinegar and water for an all natural spray.
Do not ever take on more than one horse, unless you can truly afford to keep it and keep it healthy.
"Equine-facilitated therapy employs a form of biofeedback for practicing self-awareness, emotional management, and relationship skills that human role-playing exercises and discussion groups cannot begin to access." Linda Kohanov (The Tao of Equus)