I am planning on getting a large property next year, I don't want my dogs crapping on the areas where we play with them and my son will be running around by then. I am planning on creating a kind of gated area where I can send my dogs to crap there that way I can maintain that area and keep the pooping contained. What kind of floor do you recommend for that use? enclosing a grassy area would be pointless since I will have to cut the grass and depending on the size it will be difficult to get a ride on mower in there.