Mo. Rev. Stat. § 262.008

The governing body of all national, state, and local fairs, expositions, and pet shows conducted in this state which include the exhibition of livestock or domestic animals shall permit all livestock breeders and domestic animal owners to exhibit livestock and domestic animals at such fair, exposition, or pet show. The governing body of each national, state, and local fair, exposition, or pet show shall have the authority to establish rules and fees for participation in its individual events.