Mo. Rev. Stat. § 272.240
Whenever the owner of real estate desires to erect or construct a lawful fence which wholly or partially borders the land of another, he shall notify the other owner that he desires a division fence. If within ninety days after receiving the notice, the other landowner has not erected or constructed one-half of the division fence, the owner desiring the fence may apply to the associate division of the circuit court for an order to proceed with the construction and ordering the other landowner to pay one-half the value of so much thereof, as borders his land, and upon the payment shall own an undivided one-half of the fence; except that no owner shall be required to pay more than one-half the value of a lawful fence of four barbed wires, regardless of the type fence constructed. The associate division of the circuit court costs shall be taxed against the other landowner.
§ 272.240, RSMo