Source: https://www.amazon.com/PetBed4Less-Orthopedic-Removable-waterproof-replacement/dp/B01L53EWCW/ref=sr_1_3?tag=thelabsit-20&s=pet-supplies&ie=UTF8&qid=1491812145&sr=1-3-spons&keywords=orthopedic+dog+beds+for+large+dogs&psc=1