Dinohippus is an extinct equid which was endemic to North America from the late Hemphillian stage of the Miocene through the Zanclean stage of the Pliocene and in existence for approximately 6.7 million years. Fossils are widespread throughout North America, being found at more than 30 sites from Florida to Alberta and from Mexico all the way down to Panama. The majority of fossils of Dinohippus have been unearthed in the Western United States in Nevada, New Mexico, Utah, and California.