Mo. Rev. Stat. ยง 272.235
272.235 Adjoining landowners obligated to build fence โ when โ exceptions.
272.235. Adjoining landowners obligated to build fence โ when โ exceptions. โ 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.
(L. 1965 p. 395)