I have a 1.5 year old mini rex named Helix. Every once in a while when he's playing he will suddenly stop and stare at a wall. Then he will continuously thump and run with his ears back. He seems really scared. There is no noise nothing on the wall absolutely nothing. I don't know why he does this. Last night at 1am he kept thumping and when I checked on him there was nothing there to spook him. He's playing right now and thumping and staring at a wall I don't know why though. Any ideas how to help calm him down? Thanks