Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 41, § 100H

If an action is brought against a law enforcement officer because of damage caused by a dog which said officer was caring for or maintaining in connection with his official duties, the political subdivision employing said officer shall indemnify him for expenses or damages incurred in the settlement or defense of such action; provided that in the case of an officer employed by a city or town such settlement or defense shall have been made by the city solicitor or town counsel or by an attorney legally employed for the purpose by a city or town.