How to measure a horse for Hoof Boots
The measurements should be taken in metric (mm), and just after a fresh trim where possible for optimum accuracy.
All hoof boots are designed with a growth tolerance (based on a naturally trimmed horse) built in. The width is taken at the widest point of the horses hoof, and the length is taken to be the weight bearing surface of the hoof.
Do not include the frog/fleshy part of the heel.
It is helpful to hold a straight edge across the back of the bottom edge of the heel buttresses and the measure from the toe, bisecting the frog to the line you have formed.
If the horse has very upright or under run heels, you will need to envisage where the heel should be if the hoof was without pathologies, and take your measurements to that point, and not the actual point of the buttress to allow for the extra length of hoof behind the buttress line.