Stone Circle Shades of blue

Sophy watched as he bega scratching again in the sand. At first, it was him scratching her age next to his, as if comapring. Then he muted wolf moved over to another cleared area of sand, and he began scratching again, or rather pressing into it with his paw. She counted seven presses in a line, one of them pressed on twice. This she did not understand right away, and shot him a confused look with the tilt of her head. "I don't...Seven paws? Seven..." What could have it been seven of?