Dominant White 19 (W19) is found in Arabian horses and may result in a bald face with extended white on legs and belly spots for heterozygotes (W19/n). Homozygotes are reported to be nearly completely white with varying degrees of congenital birth defects and it is estimated that combinations of W19/W19 and other W19/X combinations may be largely lethal.

Dominant White 20 (W20) is found in many breeds and may result in white markings.

Dominant White 21 (W21) is found in Icelandic horses and may result in a white face/ body speckling and body spots.

Dominant White 22 (W22) is found in Thoroughbreds and may result in a sabino-like to completely white coat.

Dominant White 23 (W23) is found in Arabian horses and may result in a mostly white coat color. this coat color is considered extinct.