The part about the your aunts dog reminded me of our cats. They freak me out all the time. One night I was playing with our then kitten, Hello Kitty, when she stopped and looked up at the spot where the wall meets the ceiling. Then, she started running back and forth meowing and looking at that same spot. I got up and looked for bug or something but nothing was there. This went on for at least 5 minutes. I was very happy when my husband got home!
After a few years we got another cat, a little all black cat named Lucky. She will stare at the same spot that the other cat looked at and also follow something with her eyes. It's sort of like when you play with a flashlight with your cat or dog and thier whole head follows the spot it makes on the wall.
She also stands on the back of the couch, stares at the ceiling and meows like mad at nothing. One time she did it at the top of the bed while I was laying in it. That freaked me out. Then she tried to hit it with her paw. I turned around and she had found a spider. :-)
LOL - a spider! =)
Creepy about the spot on the wall though...*shiver*
Mine does that, too. The logical explaination would be the cats were hearing noises in the attic or walls of maybe squirrels or mice. But who knows.
One year it threw eggs.