Many dogs will circle around a spot before they settle down to rest. While no one can be certain of the exact reason why canines do this, the ritual is likely a residual habit from the days when wolflike dogs lived out in the wild, says veterinary behaviorist Dr. Karen Sueda, DVM, of the VCA West Los Angeles Animal Hospital.
Your dog’s ancestors had to sleep outside, in the elements, without much warmth or safety. Walking around a spot was a way to stamp down grass, leaves or snow and create a soft, level surface — something akin to carving out a nest.