Section 39B. Every person engaged in operating a guard dog business shall obtain a license therefor from the director, the fee for which shall be determined annually by the commissioner of administration under the provision of section three B of chapter seven for the filing thereof, and such licenses shall expire on December thirty-first following the date of issuance, unless sooner revoked. The director may make rules and regulations governing the issuance and revocation of such licenses and the conduct of the businesses so licensed, and relative to the maintenance of the premises and conveyances, the health of the dogs and the method and time of inspection of such businesses.