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Dominant white is a group of genetically related coat color conditions in the horse best known for producing an all-white coat, but also for producing some forms of white spotting and white markings. Dominant white horses are born with unpigmented pink skin and white hair with dark eyes, although the amount of white hair can vary. Dominant white is a rare condition, and under normal conditions at least one parent must be dominant white to produce dominant white offspring. However, there are documented cases where dominant white has occurred as a spontaneous mutation. Dominant white can occur in any breed, and has been studied in many different breeds.

Dominant white is genetically distinct from Sabino and both genetically and visually distinct from gray and cremello. Dominant white is not the same as lethal white syndrome, nor are dominant white horses "albinos". Albinism has never been documented in horses. Some forms of dominant white are thought to result in nonviable embryos when a zygote has two W alleles (homozygous). However, this has not been verified for all dominant white genetic variations.