Walking in the Norwegian woods, where wolf-hunting is restricted and populations are being brought back from the brink, my family and I had gotten about 100 metres from the car. On a little wooden bridge over a creek, where we stopped, the valley suddenly filled with the incredibly loud sound of many dogs or wolves baying, howling continuously. They couldn't have been more than 20 metres away, judging from the deafening volume.
We bolted for the car without looking back.
I'll never know if they were wolves, though I can't imagine someone taking a dozen dogs for a howling session in the woods.