Mo. Rev. Stat. § 322.040

Whenever rabies becomes prevalent in any city, town or village in this state, the mayor of such city, town or village shall, according to the necessity of the case, issue a quarantine order, requiring every owner or person in charge of any dog or dogs within the limits of such city, town or village, to either kill or impound his dog or dogs, or to have such dog or dogs immunized. Said order shall be published once in the paper officially publishing the business of such city or town; and in the absence of such paper, shall be posted as in case of sales of personal property. The mayor of such city, town or village is authorized by proclamation, to terminate any such quarantine whenever, in his judgment, the necessity for it no longer exists.