I own a couple indoor plush dog houses and my dog LOVES them. Her favorite is the log cabin style. They are kind of expensive, but totally worth it! This is probably her absolute FAVORITE of all beds, she goes and "hides" in it all the time, the cushion on the inside is so soft and washable. Here is where I got mine. The link shows a couple others. I also have the cabana bed that is shown on this page.
small dog house plush beds tents - Paws Around Town