Great dog bed.   I got the XL for my 100 pound, young chocolate lab.   He doesn't make it sink down.   I got on it with him and it still didn't sink.   The cover is sturdy, not as sturdy as some, but better than many.  You won't be disappointed in your purchase especially considering the price.  Bear's new bed is so nice, I finally bought myself a new "human" bed the next day!  I'm a big Chewy.com shopper.  Still love Chewy.com, but this bed exceeds the may bed's I've purchased from Chewy by far.  Buy it, your furry friend will love you for it.