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AQHA Rulebook schreef:

(d) White Markings: A horse having white markings with
underlying light skin beyond any one of the following described lines
shall be eligible for registration by AQHA only if it is parentage verified
through DNA typing the offspring, its sire and its dam. Breeders
should be aware that the American Quarter Horse, while long recognized,
identified and promoted as a solid-colored horse, can and
does occasionally produce offspring with overo paint characteristics.
Such markings are uncharacteristic of the breed and are considered to
be undesirable traits. The following notification shall be placed on
registration certificates of horses exceeding these marking limitations:
“This horse has white markings designated under AQHA rules
as an undesirable trait and uncharacteristic of the breed.”

Citaat:

(1) A line parallel with the ground drawn around the front
leg at the point halfway between the point of the elbow (the center
of the olecranon tuberosity or proximal epiphysis of the ulna) and the
protrusion on the back of the knee (the accessory carpal bone or lateral
styloid process).
(2) A line parallel with the ground at the center of the
gaskin on the hind legs. (The center of the gaskin shall be defined as
an imaginary point on the front of the gaskin equidistant between
the stifle joint and the center of the hock.) The top point of reference
to be the bony protrusion on the inside (medial) of the stifle region
(technically known as the medial condyle of the tibia) and the most
prominent bony protrusion at the top and inside of the hock (technically
known as the medial malleolus of the tibia).
(3) A line around the horse’s neck immediately behind the
poll and through the midpoint of the throat latch.
(4) Within an area described as two inches on either side of
the ventral midline, beginning at a point midway between the front
legs and extending to, and including, the sheath and udder.
(5) Additionally, there is allowed a single area of white
markings with underlying light skin, such that it can be completely
covered with a disk one inch in diameter, either free standing on the
horse’s body or being a portion of white marking extending past the
above prescribed lines.
(6) Areas of white, pink or mottled skin located on the
horse’s genitalia, including the sheath or udder, in the axillary region
(armpits) or inside the hind legs, including the inner surface of the
hindquarters up to and including the ventral surface of the tail, and
which are not readily visible when the horse is in a standing position
are not considered white markings as described in (d) above.

Citaat:

The American Quarter Horse has
long been recognized and identified as a solid color horse. Obvious
excessive white markings are considered undesirable traits according
to Rule 205 (d), and shall be judged accordingly.