A calming bed — sold as a “donut,” “cuddler,” or “anti-anxiety” bed — is a round or oval bed with a continuous raised rim and a soft, fiber-filled surface, built so a dog can curl inside it with something touching them on most sides. There is no published controlled research showing that donut-shaped beds reduce…

A bolster dog bed is a flat sleeping mattress with raised, cushioned edges — bolsters — along one, two, three, or all four sides. Those edges give a dog something to rest their head against and lean into, which suits dogs who curl, wedge themselves into corners, or sleep with their chin propped up. The…