Here is a crazy thought. Maybe your dogs are seeing ghosts. I live in a 1909 farmhouse and we have even watched his toys raise and splat down on the bed right in front of us. Have you ever seen a dog running scared out of a room for no reason? Sure, there are many things that can grab a dog’s attention, but I think that they are psychics, and I believe that they read minds, so why stop there?
Yes, I accept that this sounds a bit off. Consider it a suggestion, nothing more.