Out with my dogs at dawn years ago in the Manifold Valley (The Peak) and saw large paw prints in the mud at the riverside.They were slowly filling with water which meant whatever left them had just gone.
The dogs bristled and growled and stared into the woods, they didn't relax until we got back to the car.
I got the hell out of there and my alsatians behaviour told me it was the wise thing to do.
I didn't see a thing,but I 'm damned sure something was watching me.
careful,you dont want to be labled as having a dangerous dog.