We had a dog when I was a teenager. He came in or out as he wished. He liked to sleep at my mother's feet. My father built a doghouse for him, with a canvas over the doorway and filled it with cedar shavings that take away a lot of the doggie odor. At night, the house got too hot for him and he wanted to go out. We'd chain him and he'd go into the doghouse, turn around a few times, and we'd see his nose come out past the canvas. He was perfectly content to stay all night in there even in winter when the temperatures might get close to 0º. He had a wonderful coat, it must have been due to sleeping out in the cold.