Overo (also known as Frame Overo) causes irregular white patterns on the sides, surrounded by a "frame" of the base color of the horse. Overo is never allowed to touch the topline/spine past the withers. On the Wyrm and Marean bloodline, overo can optionally go on the tail as long as it does not touch the topline.

Overo always affects mane where it touches.

At minimal expression overo needs to have at least one white irregular spot somewhere on the body, anywhere within the allowed range.

Large white markings on the face and legs are allowed but optional, overo white markings are allowed to extend down the legs or cause "broken" socks that don't connect all the way.