input: [State] Massachusetts [Citation] Mass. Stats. Chapter 140 Sec. 155 [Local Gov’t] Click here [Highlights] 
output: Owner is liable for all damage to the person or property of another done by his dog unless at the time the injured party is committing a trespass or other tort, or was teasing, tormenting or abusing such dog. If the injured party is a minor under 7, it is presumed that he was not committing a trespass or other tort, or teasing, tormenting or abusing the dog, and the burden of proof thereof is upon the defendant in such action.