The dog den is made very well, and seems extremely durable, just like the bed covers. I have the med/lg dog bed for our GSP. She weighs about 60 pounds, and the size of the bed works for her. But the issue I have with the den, is that it doesn't open far enough for her to get inside. I have the bed full of fill, to it's max potential which leaves very little give in the den to open. I think I will need to remove some fill in the bed. If she were a little smaller dog, she may be able to get under the den "slit", but for Nina, I have to hold the den open for her to get in, there needs to be some extra material to expand.