New York State maintains the following pet travel rules: Only household pets may travel to Niagara Falls. Pets must be caged or on a leash not more than 6 feet in length. At Niagara Falls, pets are not permitted in buildings or on improved walkways and boardwalks. Pet Travel exceptions are for certified service animals only, in which: Service animals are permitted in buildings, improved walkways and boardwalks. Service animals must be clearly identified with a vest and harness.