I have always felt that dogs are psychic.

Back when I was in the Army we worked some nasty mean bite dogs. We had to clear an old hospital complex and none of the dogs would go into the basement type area. Turned out it was the old morgue.
I was watching a buddy working his special service dog (SSD, they work on remote voice command) when the dog just stopped in it's tracks, backed up slowly, as to tell us to not go any further. It turned out to be an EFP that was active on a motion sensor. The dog knew not to go to the source and alert, even though it was never trained to back up or respond like that.
I had a dog that hated my (then, now ex) wife and never could understand it until she divorced me.
They just know.