I ordered one of these for a feral cat that took up residence in my yard three years ago. I placed it inside a very large plastic container with a lid and an entrance hole cut into it ( also had to make a small hole near the bottom to let cord out ). For added comfort, I put fleece blankets on top of the heating pad. The cat absolutely LOVES his heated "cave". The fleece blankets are easy to wash, and he stays warm and safe. The heating pad has worked three winters without any problems so far. A life saver for all outdoor animals ! Manufacturer's comment to this post: Please do not place any materials on top of the Extreme Weather Heated Kitty Pad as shown by this consumer. The Extreme Weather Heated Kitty Pad includes a free fleece cover or you may purchase a Deluxe cover through retailers. These are the only materials that are to be used with this pad.