Things You'll Need
- Cloth tape measure
Instructions
Tie or cross-tie your horse to prevent him from moving around as you try to take the measurements.
Stretch the cloth tape measure from just below your horse's knee joint to just above the fetlock (ankle) joint.
Measure the widest part of your horse's fetlock joint.
Compare these measurements to the boots you are considering purchasing. If one measurement requires, for example, a size large boot and one measurement fits the medium size, go ahead with the bigger size.