A dog run is an area confined with a chain link wire mesh where your dog can run about and get some exercise. When running is not encouraged, your dog may get lazy, and the only exercise he may get is walking between his food bowl and his bed. Lack of exercise could lead to obesity and other health hazards. A dog run can give him some exercise in a safe environment. Some fixed dog runs include a roof, a kennel and a feeding area. Portable dog runs are available that could be set up at your vacation spot. Dog runs must be set up in a shaded area and have enough space for your dog to run about.