I was told that by my Valley farmer friends! My two labs slept on a moving cement patio during Coalinga in 86! They had been swimming for a while but I gotta say..they were cute but dumb.
Loved em to pieces!
Our dogs(A Pomeranian/Maltese mix and a Shih Tzu) didnt give us any warning of the quake a few weeks ago, not a peep, actually totally normal, when the quake hit they ran under the table LOL..some dogs will give you advance warning like jump on you and start barking, but that can be confused with “I gotta go outside and do my business” so sometimes its hard to tell