A foundation horse is the kind of horse that every player starts with. A foundation horse is born from Ouranos and Gaia. With the exception of donkeys, this horse generally has 350.00 or 351.20 genetic potential, due to past foal games that added an extra 1.2 gain to genetics. and 0 inborn skills, anything otherwise is not considered a foundation horse.
A common confusion when a foundation horse is under the age of 6 months is the Equestrian Center notice stating that the horse cannot be boarded. There, is supposed to be a display of a foal's dam, or mother. However, for a foundation horse this is just a future picture.