BIGDOGBRAG The Colorado Mud Run gives you more unique ways than any other obstacle course to experience the thrill of mud!!! You can splash, crash, run, crawl, laugh, slide, walk or do your own style of doggie dash to the finish by choosing either the 5k course with all 25 obstacles or the 2k (more fun than run course) with 12 of our funnest obstacles and muddiest mud pits for the whole family ages 5 and up.