They go in specific areas and we always pick up right after them with doggy bags. The urine is sprayed off with a hose into a large garden area covered in large sized gravel. I know...it sounds rather gross but it works well for us. Before, when we had grass the dogs would track mud into the house after they did their business. The grass would also get unattractive dead patches in it from the urine. And the dogs actually made little trails in the back yard (it rains a lot in the winter here).