Mass. Gen. Laws ch. 129 § 7
For the purpose of inspecting or examining animals or the places where they are kept, the director, any of his agents or an inspector, duly qualified, may enter any building or part thereof or any enclosure or other place, and may examine or inspect such animals or places. Whoever prevents, obstructs or interferes with such director, agent, inspector or other person having like authority in the performance of any of his duties, or whoever hinders, obstructs or interferes with his making such inspection or examination, or whoever secretes or removes any animal, for the purpose of preventing it from being inspected or examined, shall be punished by a fine of not more than one hundred dollars, or by imprisonment for not more than two months, or both.
Mass. Gen. Laws ch. 129, § 7