Horses are originated from the dawn horse, Eohippus, also know as Mesohippus. Eohippus was a small, dog-sized creature with teeth made for browsing rather that grazing. It had many toes, unlike the modern horses.
Most horses orginated and migrated from Europe and Middle East.
Scotland
chihuahua
The Reuben.
Shinto
Japan in 1893
Calypso.
tanzania
in the year 2008
China
The United States of America
They orginated in japan.