Size: Medium Its a proven fact dogs are most at ease when curling up in a ball to sleep, it gives them warmth and a feeling of security. Jax and Bones Donut beds are made to embrace the natural way dogs like to rest and Recharge. Constructed using top-of-the-line heavyweight Textured fabric that looks and feels like Wool but is made from a durable blend of polyester. Cover and inner pillowcase unzip to make it easy to machine wash and dry cover. Overstuffed sides are filled using our signature, hypoallergenic fiber, sustainafill. Medium bed is perfect for dogs up to 40 lbs.