Skewbald

In British equestrian use, skewbald and piebald (black-and-white) are together known as coloured, and the white markings are called patches.

In North American equestrian usage, the term for all large-spotted colouring is pinto, and the markings are called spots, The specialized term paint refers specifically to a breed of horse with American Quarter Horse or Thoroughbred bloodlines in addition to being spotted, whereas pinto refers to a spotted horse of any breed.

Then the horse has an allele for one of three basic spotting patterns overlaying the base colour.

The most common coloured spotting pattern is called tobiano, and is a dominant gene.

Three less common spotting genes are the frame and splash overo genes, which create a mostly dark, jagged spotting with a horizontal orientation, white on the head, but dark or minimally marked legs.