I was unsure whether my 14 year old dog would take to his new cave, but he used to love to dig under the covers, so I took a chance.  He cuddles in it day and night!  I did remove some of the stuffing, folded a bed pillow and wedged it in the back end, and another throw pillow on one side to keep the "roof" up until he got the hang of it.  Also I had to exchange for the next size up because he needed room to turn around while inside. Wayfair was very helpful with the exchange and the new one came quickly.  The fuzzy inner lining creates a fair amount of lint,  I feel it should be laundered and happily, can do it. My other dog got used to it by my throwing her favorite toy inside, and she'd run in after it. She still prefers to sleep on the top, luckily not  when my other dog is inside!