Bolster beds have raised walls on some or all sides, creating a cozy nest that many dogs instinctively prefer. If your dog sleeps curled up or likes to rest their chin on something, a bolster bed is the move. Sofa-style beds have a flat sleeping surface with bolsters on three sides — great for dogs who like to stretch out but still want a headrest.
Fill material determines how long the bolsters hold their shape. Polyester fiberfill is cheap but flattens fast. Recycled fiber fill holds up slightly better. The best bolster beds use dense foam bolsters with a fiber top layer for softness.
Size the bed so your dog can stretch out with their back against the bolster. A bed that's too small forces them to curl up even when they'd rather spread out. If your dog is between sizes, always go up.