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Sorry, I hit post before I finished. Navicular is different than founder because it deals with the changes in the navicular bone itself. Founder deals with the lamine and the coffin bone. The navicuar bone is kind of wedge shaped and helps distribute weight evenly. It lies behind the short and long pastern bones, and in front of the flexor tendon. Navicular or navicular changes occur when the sinovial fluid that surrounding the bone dries up so that you end up with bone rubbing against bone, which causes leasions, holes and lollypop like bumps of bone on the navicular bone itself, and eventually, the bone will wear away almost completely in some severe cases. Navicular changes occur when the structure of the bone itself starts to change. That isn't necessarily full blown navicular, and is easily treatable.