Section 160. The county commissioners of any county, the mayor of any city, the selectmen of any town, or their agents thereto authorized in writing, may, after written notice to the owner or keeper, enter upon the premises of the owner or keeper of any dog known to them to have worried or killed live stock or fowls, and then and there kill such dog, unless such owner or keeper whose premises are thus entered for the said purpose shall give a bond in the sum of two hundred dollars, with sufficient sureties, approved by the county commissioners, conditioned that the dog shall be restrained for twelve months next ensuing. And if the owner or keeper of the dog declares his intention to give such a bond, said selectmen, chief of police or county commissioners, as the case may be, or his or their agents, shall allow him seven days, exclusive of Sundays and holidays, in which to procure and prepare the same and to present it to them, or to file it with the clerk of the town where the said owner or keeper resides.