When things stopped shaking, the dogs' barks got dimmer and lower. Animals know, they feel things and sometimes try to alert us and we just don't have the intuition or the wisdom to trust the animal world.
How about you? The first quake I ever felt was last year in Washington, DC (out of all places!) It turns out there is a seismic fault along the West Virginia/Virginia boundary that's pretty much overdue in seismic activity. And that was rather strong and long. It was felt all the way in Canada. Have you ever felt an earthquake?