If your pup curls up to sleep, the Round Pet Bed will be perfect! (Choose the Rectangular Pet Bed if your dog stretches out.) Small: 26" diameterMedium 36" diameterLarge 44" diameterX Large: 52" diameterABOUT OUR INSERT:Our new insert is filled with recycled foam in bigger chunks, making it loftier and more cushioning, easier for pets to move around on – and to create the perfect comfy nest. The shell is 100% polypropylene, a fiber so tough that it's often used in outdoor products like rugs. This allows the shell to be much thinner and lighter than the former cotton shell. (Yes, it’s thin enough to be translucent, but that’s the beauty of this fabric: it doesn’t need to be heavy to be dependably tough.) Flat rate shipping everyday.