We got this mattress for our Miniature Long-Haired Dachshund.  She is 4 and hurt her back. We got a great brace for her ("lil back bracer") but she wasn't totally comfortable. We own a Casper from over 3 years ago and just got the new Wave, which we LOVE. We got the dog Casper mattress, and Lady LOVES it!  She is very comfortable as it molds to her body no matter how she sleeps. She loves to rest her head on the side, really this is a very well-made and well-thought of mattress for dogs. Thank you for the innovation Casper!