LICENSING OF DOGS RSA 466:1
Every owner or keeper of a dog 4 months old or over shall annually, cause it to be registered, numbered, described and licensed for one year in the office of the Town Clerk of the city or town in which the dog is kept, and shall cause it to wear around its neck a collar to which shall be attached a metal tag with the following information thereon: the name of the city or town, year of issue of license and its registration number. Regardless of when the license is obtained, the license shall be effective from May 1st of each year to April 30th of the subsequent year.