Measure just the hoof, widest point over the quarters to get the hoof width and from the toe to the buttress line (line between the end of the hoof wall/bars) to get the length. Each hoof needs to be measured, at least twice boots really need to fit well
All the hoof boot websites will have pictures of how to measure. It more accurate to measure in metric (mm)if you can. Easyboot site also has a consultation service to help you pick the right boots and pad combo
Don't allow for the pads in the measurement think of pads as inner doles in your own shoes, almost all boots will take thin pads (4-8mm), only some boot styles will work with the thick.
Without seeing pics and your thinking about thick pads look at the backcountry (in a half size bigger than measured) for higher use or the trail boot for light riding. Also do not get doomed pads, they are not at all suitable for unsound hooves
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