Chronic lameness will change the shape of the hoof capsule, since the lame limb is not weighted as much as its partner, making the capsule more upright, narrow, with a higher heel on the lame limb and more flattened on the sound one.  Hoof or horseshoe wear can indicate breakover and if the horse is dragging its toes. Change in shape of the hoof wall is also common in horses suffering from laminitis. "Founder rings," or thickened concentric rings in the hoof wall, indicate a past episode of laminitis. Concavity of the dorsal (front) surface of the hoof can indicate chronic laminitis. The sole may become convex if the coffin bone begins to push through the bottom of the hoof.