The relationship between the frog and the coffin bone never changes. It is the only true reference, as the hoof capsule distorts under pathological conditions. A form is provided with the EDSS designed to show distortions from normal hoof shape as indicated by the study of wild horse feet. Measurements will change each time the EDSS is applied until optimal hoof shape is achieved. All measurements are taken from the toe.
Major distortions appear first in the toe and then in the heel area.
Four hoof shapes are provided on the form and the measurements are written on the shape most resembling the feet to be worked on. There is a direct relationship between hoof deformity and hoof pain. The form has diagrams so that pain response can be recorded. It also provides a way to track the hoof changes. The sole is now trimmed to reveal the true sole plane.