N.Y. Town Law § 301: Lands lying open

§ 301. Lands lying open. When the owners of adjoining lands shall

choose to let them lie open, as provided in section three hundred,

neither of such owners shall be liable to the other in any action or

proceeding for any damages done by animals lawfully upon the other's

premises going upon the lands so lying open or upon any other lands of

the owner thereof through such lands so lying open. Either owner of any

lands so lying open and adjoining may, unless the agreement is for a

specified period, and after such agreement has expired may then have the

same inclosed, by giving written notice to that effect to the owners or

occupants of the adjoining lands, whereupon it shall be the duty of both

parties to build and maintain their several proportions of a division

fence.