should dogs stay away from alien crop circles?

When I posted recently about the strange circular marks on the grass at Yarra Bend park, Lassie and Benji commented that perhaps aliens made the marks.

And here was I thinking it was just park rangers preparing for new plantings of indigenous vegetation!

Today when we walked at Willsmere Park, there were more strange circles. Maybe crop circles?

Or just patterns from the ride-on mowers...