S.D. Codified Laws § 36-12-20
Failure of a person licensed by the Board of Veterinary Medical Examiners to secure a certificate of registration shall constitute a forfeiture of a license held by such person. However, any person who has forfeited his license for a period of less than four years may have the license restored to him by making application to the secretary of the board for issuance of a certificate and by payment of the biennial registration fee. If a person has forfeited his certificate of registration for a period of four years or more, the board may restore said certificate of registration to him by the applicant making a written application for licensure on a form prescribed by the board, the payment of a reinstatement fee in the amount of one hundred dollars and by payment of the biennial registration fee.
SDCL 36-12-20