PROCEDURE
Fill a clean empty spray bottle with water. Adjust the spray nozzle to disperse a spray of small droplets or mist, not a direct jet. Stand on your horse's left side, with the spray bottle in your right hand. Hold the cheek piece of your horse's halter in your left hand or about 6 feet of lead rope. Despite holding the halter, place no pressure on your horse.
Now begin spraying the bottle directly away from your horse towards the ground. Keep spraying until the horse stops moving. If the horse moves, maintain pressure on the halter or lead with the left hand and keep spraying. The split second the horse stops moving, stop spraying. Put down the bottle and rub the horse on the neck and give them 10 seconds to rest.
Repeat this process slowly directing the angle of the spray towards them. Again, if the horse moves or resists, keep spraying and put pressure on the halter until you get a yield. The split second the horse stops moving, stop spraying. Put down the bottle and rub the horse on the neck and give them another 10 seconds to rest.
Repeat this process slowly directing the angle of the spray to the left shoulder (a comparatively less sensitive area), and gradually expand outward until you can spray your horse’s whole body, using this same method.
TIPS FOR SAFETY AND SUCCESS
Take some time to work with your horse on this issue before fly season arrives.