Massachusetts Prohibits Breed-Specific Dog Restrictions

Section 157: Nuisance or dangerous dogs; orders for remedial action; appeal; violation of order Section 157. (a) Any person may file a complaint in writing to the hearing authority that a dog owned or kept in the city or town is a nuisance dog or a dangerous dog; provided, however, that no dog shall be deemed dangerous: (i) solely based upon growling or barking or solely growling and barking; (ii) based upon the breed of the dog; or (iii) if the dog was reacting to another animal or to a person and the dog's reaction was not grossly disproportionate to any of the following circumstances: (1) the dog was protecting or defending itself, its offspring, another domestic animal or a person from attack or assault; (2) the person who was attacked or threatened by the dog was committing a crime upon the person or property of the owner or keeper of the dog; (3) the person attacked or threatened by the dog was engaged in teasing, tormenting, battering, assaulting, injuring or otherwise provoking the dog; or (4) at the time of the attack or threat, the person or animal that was attacked or threatened by the dog had breached an enclosure or structure in which the dog was kept apart from the public and such person or animal was not authorized by the owner of the premises to be within such enclosure including, but not limited to, a gated, fenced-in area if the gate was closed, whether locked or unlocked;