I have a 12 year old Golden/Lab mix and he's got joint issues. I've gone through numerous "Orthopedic" pet beds, which we all know, are somewhat expensive. They mainly have that "egg carton" type of foam, which is fine at first, however, after about a month or two the foam breaks down and doesn't hold it's shape any longer. I searched and searched, found a couple of places that carried "specialty Ortho" pet beds...again very expensive. Ordered it, and then find out that it is all on backorder for a couple of months (didn't bother telling me that). Now to my point and review... I was originally going to buy a memfoam topper for a regular bed and make one for my dog, but then I typed in "Pet Beds", and what do you know? Overstock carries it. So I ordered it, with the three day express mail. Well, I got it in two. Ordered it on Wed, was shipped on Thurs and I received it on Fri. I was very impressed with their shipping and how quickly it arrived. Luckily for me it left a warehouse in my city. When I got it, I opened it and it looked really small (it is vacuum packed and folded in half, so don't fret!), and I thought to myself, "Oh great, it was too good to be true." But once I got it out of the vacuum sealed bag and saw that it was folded, I was relieved. Anyhow, I put it on the ground and it went back to it's original shape and thickness...I suppose that's why they call it Memory Foam :-). Anyhow, my dog loves it and now he can get himself up a lot better than before. As for the "Durability" rating, I'll post again later to let you know how it holds up to a 75lb dog. I have a total of 3 big dogs, when I was allowing the bed to retake it's original form, my other two dogs laid on the bed and would not get off. I had to force them off the bed! So I will probably be purchasing two more pretty soon! Sorry for being long winded!