“Appaloosa racing” is the form of horse racing in which each participating horse is an Appaloosa horse, is mounted by a jockey, and engages in races on the flat over a distance of not less than one-quarter of a mile or more than four miles.
Source:
Section 19417.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=19417.5..