Mo. Rev. Stat. § 322.080

Any person, firm or corporation owning or having in his or their charge, any dog or dogs which have had any substantial exposure to rabies, shall upon failure to kill such dog or dogs, or to keep such dog or dogs impounded, or to have such dog or dogs immunized, be guilty of a misdemeanor; and, upon conviction thereof, shall be fined not less than one hundred dollars nor more than five hundred dollars, and such owner or person in charge of such exposed dogs shall be liable for all damages that may result from the actions of any such exposed dogs.