Dogs are not permitted on some parts of the trail, including Pictured Rocks National Lakeshore and numerous State Parks. Should you decide that your dog will accompany you on your next hike, be sure to keep him/her under your control at all times –preferably on a leash no more than 8' long. Keep your dog out of water sources and be sure to clean up after them. Pack animals and horses are currently permitted on the North Country Trail in parts of North Dakota only.
Reproduced from North Country Trail Association's website