Heat against laminate flooring causes condensation
I could imagine condensation forming on a cold floor but I would think less would form on top of your mat and dog bed.  They would not get as cold as the flooring and they would protect the floor beneath from collecting condensation.
I would think that if you were sweaty enough to soak your mat through you would notice that.  As re the pet bed - dogs don't sweat.
If moisture accumulates underneath things on the floor I think it is coming from beneath.  If there is not something on the floor it evaporates.  The bed or mat on top prevents it from evaporating into your house and it accumulates under there.
You could test this by taping a sheet of plastic wrap on the floor.  Tape around all 4 edges.  If moisture is coming up thru your floor the sheet will steam up.