Pets must be leashed at all times. Leashed pets are allowed on trails above the rim and throughout the developed areas.Pets are not permitted below the rim, in park lodging (hotel rooms), or on park buses. The only exception is service animals. Leashed pets are permitted in Mather Campground, Desert View Campground, and Trailer Village. Persons wishing to take a service animal below the rim must check-in first at the Backcountry Information Center.