Located in western North Dakota, where the Great Plains meet the rugged Badlands, Theodore Roosevelt National Park has 3 sections linked by the Little Missouri River, and is known for the South Unit’s colorful Painted Canyon and the Maltese Cross Cabin, where President Roosevelt once lived. Pets are allowed in many areas of the park, but must be on a leash no longer than 6 feet when not otherwise contained in a vehicle or ten. Leashed pets may be walked along roads and road shoulders, sidewalks, parking areas, and in campgrounds and picnic areas. The sidewalk at the Painted Canyon Visitor Center (I-94, exit 32) is a good place to walk dogs and has fantastic views of the Badlands. Be aware that dogs can agitate bison, horses, and other animals, creating unsafe situations. Maintain extra distance from wildlife when enjoying the park with your dog. Dogs are not permitted on trails within the park. Horseback riding is permitted on all backcountry trails as well as cross country (off-trail travel). Horses are not permitted on nature trails (trails under 1 mile), or in general-use campgrounds and picnic areas.
More information on the Theodore Roosevelt National Park pet policy