Dominant White 33 (W33) is found in Standardbreds, and may result in sabino-like spotting.

Dominant White 34 (W34) is found in many breeds and may result in white stockings, belly markings, and facial markings.

Dominant White 35 (W35) is found in many breeds and may result in white markings on the face, legs, and back.

Dun (D) is a dilution that affects both black and red pigment types. Two non-dun (nd1 & nd2) variants have been discovered, with nd1 being associated with primitive markings (such as a characteristic dorsal stripe) in non-dilute horses, and nd2 showing neither dilution nor primitive markings.

Equine Curly Coat is determined by two traits: keratin 25 (KRT25) and Sp6 (SP6). KRT25 is associated with persistent/complete hypotrichosis, a form of follicular dysplasia resulting in less than usual amounts of hair. SP6 is associated with a curly phenotype, without hypotrichosis.

Grey (G) is a dominant modifier that causes progressive loss of pigmentation throughout the entire body. Generally, horses are born with a darker coat color than typical, then begin to display some white hairs with the first shedding. The rate of greying is highly variable.

Incontinentia Pigmenti (IP) is a brindle-like appearance found only in female horses. Affected male embryos die during development in utero. Ip foals develop pruritic, exudative lesions soon after booth. The affected regions progress into wart-like lesions and areas of alopecia (hair loss), with occasional wooly hair re-growth. Affected horses display streaks of darker and lighter coat coloration from birth.

Lethal White Overo is a recessive trait characterized by patches of white bordered or “framed” by normal pigmentation. It is usually accompanied by blue eyes and generally white patterning does not cross the topline. Homozygous foals (LWO/LWO) are born completely white and with megacolon, an abnormal dilation of colon which necessitates immediate euthanasia.