N.H. Rev. Stat. Ann. § 466:1-b

Upon receipt of a copy of a rabies certificate from a veterinarian pursuant to RSA 436:102, the clerk of the town or city shall send written notice to the owner or keeper of any unlicensed dog relative to the licensing requirements provided for in RSA 466:1. If the owner or keeper of the unlicensed dog fails to license the dog in a timely manner, the town or city clerk shall notify the local law enforcement officer of a violation of RSA 466:1.