With a two-layer foam construction, the Orthopedic Dog Bed by PETMAKER is designed with comfort in mind. The medium dog bed features a dog bed insert with a 2-inch layer of memory foam at the base of the pet bed and another 2-inch-thick layer of high-density foam to support pets weighing up to 20lbs. Dogs and cats in perfect health as well as those who suffer from arthritis, muscle stiffness, joint and hip dysplasia will love this comfortable dog bed with washable cover.