It has never been documented in the Arabian, Thoroughbred, Standardbred,
American Shetland Pony, American Saddlebred, and some other (input welcome) breeds.
The Sorraia horse of Portugal is always dun, as are Fjordhorses and Kiger
It has not been documented among the many striped horses of
Other breeds, such as the American Quarter Horse, American Paint Horse,
Mustang, Morgan Horse, Lusitano, and Akhal-Teke, have varying percentages of dun horses among their ranks.
Click on the links to the various breeds' pages, at right or below, to find out what their
"dun status" is.