 They can't find grass because they're in Manhattan. They have to walk for blocks and blocks and blocks. And New York City dogs, many of them are trained to pee on concrete. And it's that way in other places around the world, too. So it's the substrate that matters as much as the location. But dogs do like location, location, location. And your dog's just doing what dogs do by piddling in a designated by your dog spot. So why is this a problem for you?