I am in the process of purchasing my first puppy (chocolate male, by the way), and am reading up on training. The books I read describe T and TT drills being run in overgrown fields that have been mown into these patterns. Living in the city as I do, I don't have an overgrown field at my disposal. My thoughts are to run it in a park or mown field, but I realize that if the dog can see the bumpers, then the purpose might be defeated. I know I can't be the only one in this predicament! So what do folks do when they don't have access to such a field? I searched the archive, but couldn't find any matches (didn't help that each word has to have 3 or more characters).