We have plans to build new houses for everyone once the snow is gone, as well as add a fresh load of fill on top of the sand we put in last year. The kennel yard was flat when we first moved them in, drainage being a big problem. We had sand brought in to build up the outer edges of the yard (where the dogs are) so that everything would drain down hill and out of the pen. It worked great, and dried up extremely fast in comparison to the first year. I plan to border off the dog's circles to keep the sand contained and keep the dogs yards a little more elevated to keep everyone dry and mud free. I liked the sand because it made holes easier to fill, was soft on the dogs feet and made clean up easier, was kind of like scooping cat litter. When it rained it drained quickly, everyone can lie down on the ground right after a rain even with the ground being wet and stay farely clean. If all goes well....we also have plans for a large excersie yard in the back.