(c) refuses to the inspector, acting in execution of this Act or of any regulation made thereunder, admission to any pen, building, land, place, vehicle, vessel, or boat, which such inspector is entitled to enter or examine, or obstructs or impedes him or her from so entering or examining, or otherwise in any respect obstructs or impedes the inspector or any constable in the execution of his or her duty, or assists in any such obstructing or impeding;