We purchased this bed in the smaller version several months ago. Our dog is 65 lbs and 13 years old and she did sleep better, didn't get up and move around as much at night. The foam is not very dense and while I think that helped her by not being too firm, it started to flatten out pretty quickly. So after a few months I ordered another one. This time, whether in error or for some other reason they sent the larger size instead. IT COULD BE MY IMAGINATION, but it seems to me the foam on the larger one is deeper but is also even less dense than the foam in the smaller one. The foam on this bigger one began to flatten out after the first usage and is just like the first bed after only a couple of weeks. Keeping in mind that the less dense foam seemed to help our dogs old bones, in my opinion this might be a great bed for a really small dog but the foam just does not hold up for a bigger dog.