Why do dogs circle before lying down?
It is probably a mix of inherited nesting behavior and simple comfort. Excessive circling or trouble settling can also signal pain or mobility problems.

Key points
A common nesting/settling behavior
Comfort, environment checking and inherited behavior
Excessive or painful circling can warrant veterinary attention

A ritual older than the dog bed
Domestic dogs inherited many behaviors from wild canids. Turning and pawing before rest may have helped prepare vegetation or soil and create a more comfortable sleeping spot.
Comfort is enough of an explanation
Not every spin needs a single evolutionary story. Dogs also reposition themselves for temperature, support and body comfort, just as people adjust pillows and blankets.
When the pattern changes
Veterinary sources note that repeated circling, difficulty lying down, frequent rising or signs of discomfort can occur with orthopedic or neurologic problems. A new or escalating behavior is more informative than a dog that has always done two circles before sleeping.
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