I'll share two different things that have happened to me.
First one was years ago during a meteor shower. I remember that it was during a cold month because my husband & I were snugged up under blankets on
our back deck, we live up on a ridge so. It was late or early (how ever one likes to view it), everything was quite around us. We had just starting
seeing some good trails across the sky when all of the dogs in the valley below us just went nuts, they were all howling. Not barking, but howling. It
was very strange!
Second one has been going on off & on for the past 4 months or so. I've been noticing a small vibration coming up through the floor of our house. A
couple of times it has happen both of our dogs get up and start whining and pacing around. When ever that happen I always check the USGS Earthquake
map, but they only show M2.5+. One thing I would like to note that a few months ago I read a thread about a new fault found along the Appalachians,
(my house sets in the foothills of the Smoky Mountains).
Link to thread.
I'm thinking our furry friends just have better radar for whats going on around us.
I also found another website that shows earthquakes below M2.5.
Link
I'm thinking I need to start keeping a journal and check it against this website when it happens in the future.