Beds are round, dogs seem to love having a built-in pillow for their head. Some of them will drape over the raised edge, half in and half out of the bed; must feel good on their tummy.
The bottom is an 18-inch diameter disc, sandwiching batting and quilted with yarn or machine quilted for stability. The "side" is bolstered with poly-fill, firmly stuffed. The beds are machine washable. Some are made with cotton, and some are made with fleece.