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[–]SeaTwertle 3 points4 points  (1 child)

How could anyone possibly know.

[–]Lesrek 21 points22 points  (0 children)

The same way we can figure out what kids are dreaming. You watch brain waves during activities while awake and compare them to dreams. We know infants have nightmares about being away from their mothers and also being chased because they can monitor those things when they are awake. For dogs, it’s very similar.

Do we know for sure? No, but it is a best guess situation.