If you have a dog that likes to burrow under blankets, then this is for you! My Dachshund loved this from the second I set it out for him.  I bought the large one, which gives him plenty of space inside.  It washes up nicely too.  There's a tiny hole on the side to remove the plastic pole that supports the opening.  It was tricky to find at first.  But it removed easily and I was able to put it back in easily too.  There is a zipper so you can remove the round insert.  I'm going to order another one for my newest addition to the family a Dachshund/Chihuahua mix.