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Step 1
Look at the horses head before selecting size. If the horse is a small quarter horse, arab or other small-headed breed try a cob size, If the horse has an average head size use a horse size. If the horse is a large thoroughbred or warmblood you might need a warmblood size. Draft horses also have their own sizes. These sizes vary by brand, bridle type and the shape and size of the horse’s head.
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Step 2
The cheek pieces on the bridle should allow you to place in bit correctly in the horse’s mouth. There should be one or two wrinkles at the corner of the horse’s mouth. If the horse looks as if he’s smiling it’s too tight. If the bit has clearance between the bit and the corners of the mouth, it’s too loose. The bit should fit comfortably. If the horse objects and the bit is fitted properly, check to make sure the bit is not backwards as this will have a nutcracker effect and cause some horses to react violently. If everything is correct and the horse still isn’t comfortable, have your vet check the horse’s teeth for sharp edges and wolf teeth. Most horses need their teeth floated every six months to one year by a vet or equine dentist .
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Step 3
The brow band should fit loose around the upper part of the horse’s head. If it is too tight you can change it out for a larger one. It should not be so loose that it flops.
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Step 4
A regular noseband should rest two finger-widths underneath the cheekbone and fit snugly.
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Step 5
Check the throat latch to make sure you can fit your hand with fingers spread between the side of the horse’s cheek and the throatlatch.
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Step 6
Rein length should be long enough so that the rider has about six to eight inches slack when holding the reins correctly. The horse’s neck length determines rein length.
