Mo. Rev. Stat. § 272.235: Adjoining landowners obligated to build fence — when — exceptions.

If there is a need for a fence by either of two joining landowners both shall be obligated to build and maintain a fence under the provisions of sections 272.210 to 272.370. Nothing in sections 272.210 to 272.370 shall prevent joining landowners from agreeing that no fence is needed between their property.