Mass. Gen. Laws ch. 128 § 2B
Every person engaged in the business of operating a riding school or a stable where horses are kept for hire, shall obtain a license therefor from the commissioner, the fee for which shall be $100, and such license shall expire on March thirty-first following the date of issuance, unless sooner revoked. The commissioner, subject to the approval of the governor may make rules and regulations governing the issuance and revocation of such licenses and the conducting of the businesses so licensed and relative to the maintenance of the premises, buildings and conveyances, the health of the horses or other equine animals, and the method and time of inspection and checking of said animals. Whoever violates any provision of this section or of any rule or regulation made thereunder shall be punished for a first offence by a fine of not more than one hundred dollars and for any subsequent offence by a fine of not more than five hundred dollars, or by imprisonment for not more than two and one half years, or both.
Mass. Gen. Laws ch. 128, § 2B