I bought the largest size available, but when my 56 pound dog laid on it the whole thing collapsed.  She practically rolled right out of it.  The center cushion is actually even with the height of the bolsters so the sides don't hold up as shown in the picture once there is weight on the bed.   Although it's very soft, it's too squishy for a heavier dog.  Also beware of return costs.  I was charged $41+ to return this $51+ item!  I called Wayfair and customer service was nice enough to issue an additional one-time refund, but be wary when you process a return.  Be careful to look at the return shipping costs.  Even though this package was very light, it was very large and apparently FedEx charges by weight AND dimensions.  Because of this experience, I will not be ordering any large items from Wayfair in the future and will be extremely careful to look at return costs BEFORE ordering anything at all.