Can we discuss more about the huge black dog and what it represents?

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Can we discuss more about the huge black dog and what it represents?
I went to the gym last night and since I live a bit away, I went through woody fields on my bike to cut the way short. I saw on the road ahead of me what appeared to be a man dressed in black simply standing in the road, so I wanted to avoid him. As I passed by, I noticed it's not a man but the biggest fucking black dog I've ever seen in my life, standing like pic related, on the side of the road. Didn't seem to have any owned or anything.
Needless to say I got spooked and came back home the long way.

What do the black dogs represent? I don't want to jump to the conclusion that it's some kinda paranormal demon dog bullcrap, but there's weird things around these parts (famous UFO sightings and photos, disappearances, time anomalies, ghosts, demon sounds in the forest etc)
There's also old people saying that the woods are inhabited by dog men who are vicious. Many people were attacked by, hear this, dogs that live in the forest. Dogs can live well in the city as stray dogs, but I don't know about dogs living in the forest. Why would dogs live in the forest?

Fucking crazy.