N.H. Rev. Stat. Ann. § 467:1

An owner or keeper of a bull more than 6 months old, who willfully or negligently permits such bull to run at large, out of the enclosure of such owner or keeper, shall be guilty of a violation, and any fine collected hereunder shall inure to the use of the town in which the offense was committed, and shall also be liable to a party injured for the damage done by such bull while running at large.