What it often means
- Making the bed: circling tamps down and arranges the spot, the way his ancestors did in tall grass or snow. It is the most common explanation.
- Getting into position: turning helps him curl up nose to tail, a posture that holds in body heat.
- A last look around: probably a final check of the surroundings before letting his guard down, inherited from animals that slept outdoors.
- Marking the spot: when he paws at the cushion before circling, he may leave scent from his paw pads. That remains a hypothesis.
- More rarely, discomfort: a dog with sore hips, back or belly circles for a long time because no position brings relief.