This is either a new sette or one I have not seen before, and I have hunted this part of this hedge for quite a few years. No one was home on this day.
From the look of the wide spray of dirt when this was dug, it may have housed a fox this last winter. Fox dig like a dog, and toss the dirt well back. The shape of this hole is pretty horizontal for a fox however, so it's not crystal clear.