A horseshoe with splaying and flexibility features has a U shaped compliant metallic unitary body having left and right wings and a central toe area integral with the body, and a compliant leaf-spring formation disposed proximate to or as part of the toe area. The leaf spring is arch shaped and resiliently deforms and exerts horizontal pressure sideways on the left and right wings thus splaying the left and right wings. The arch shape forms a cavity which is optionally filled with a resilient material, e.g., polyurethane, to prevent accumulation of debris in the cavity. Contiguous serrations on the left and right wings provide relative vertical flexibility of the left and right wings. The splaying and flexibility enhance horse-hoof comfort and hoof-structure regeneration. The horseshoe may be cast/forged, blanked, or welded or produced by mechanical joining. Hardened stainless steel or Titanium, or other material may be used for the horseshoe.