I'm kind of on the fence about the paranormal but don't forget that doggies' hearing is about a hundred times better than ours. They could be hearing rats or mice. My dixie dog will go ballistic if she hears a hedgehog outside and I can't hear a thing! If they hear something like a mouse in the ceiling, they might not know what it is (if they haven't seen one before) that might explain the defensive behaviour. |