Mo. Rev. Stat. § 578.011: Animal trespass, penalty.

1. A person is guilty of animal trespass if a person having ownership or custody of an animal knowingly fails to provide adequate control for a period equal to or exceeding twelve hours.

2. Animal trespass is an infraction upon first conviction and for each offense punishable by a fine not to exceed two hundred dollars, and a class C misdemeanor punishable by imprisonment or a fine not to exceed five hundred dollars, or both, upon the second and all subsequent convictions. All fines for a first conviction of animal trespass may be waived by the court provided that the person found guilty of animal trespass shows that adequate, permanent remedies for trespass have been made. Reasonable costs incurred for the care and maintenance of trespassing animals may not be waived. This section shall not apply to the provisions of section 578.007 or sections 272.010 to 272.370.