Animal hospitals and kennels shall be located no closer than 100 feet to any residential zone line. Such facilities shall be maintained in an enclosed structure and shall be of soundproof construction and so operated as to produce no objectionable odors at the property line. Open kennels, exercise pens or runways shall not be located closer than 200 feet to any property line and shall be subject to noise and odor controls established for an enclosed building. Open kennels, pens or runways shall not be located within a wetland area, wetland buffer or flood hazard area.