To measure for a winter horse blanket, measure from the horse's chest, along the horse's side, to the middle of the horse's tail. (You can use a string, if you have no measuring tape.) Horse blankets are sized in even numbers, so if you get an odd number, order the next higher number.
EXAMPLE: If your measurement is 75, order 76.

Be sure to measure accurately, so the blanket will stay in place!