Mo. Rev. Stat. § 340.255
Any veterinarian licensed under sections 340.200 to 340.330 who is not practicing or involved in any aspect, administrative or otherwise, of veterinary medicine in Missouri, as defined in section 340.200, may request that his or her license be placed on an inactive status. Any veterinarian requesting his or her license to be placed on an inactive status shall file an affirmation with the board stating that he or she will not engage in the practice or be involved in any aspect, administrative or otherwise, of veterinary medicine in Missouri. To renew such inactive license, the person shall submit an application for licensure renewal, pay the renewal fee, and submit approved continuing education hours as required by rule of the board.
§ 340.255, RSMo