N.H. Rev. Stat. Ann. § 436:24

The commissioner shall adopt such rules as he may deem necessary relating to the importation into this state of horses, asses, mules, sheep, swine or other domestic animals, except as provided for by RSA 436:10. He may require that a physical examination or test be made of every such animal brought, driven or shipped into this state, may adopt quarantine rules for all such animals and may adopt whatever rules he deems necessary to prevent the introduction into this state of contagious or infectious diseases.