A few years back I worked with a horse that reared
every time leaving the boarding stables and scared the living daylight out of
his owner, she was ready to sell the horse.
What I did was cutting a piece(3.5 feet) off a
stiff garden.
As soon the horses body cam up I tipped the horse
between the ears, please don't hit just tip, the results where awesome. She
capped the horse.