Ok so I have a male Sheltie 7 months old, I have only had him for about a month so far. He will not go poop in the grass. He will pee in the grass, but he will not poop in it. He goes to the gravel and rocks and does a little (what I call lol) walk-a-poo. But he will not do it in the grass. Can any out there help me understand why he is doing this? Or if anyone knows how I can get him to correct this problem? Please help.