Originally Posted by De Maria

When did that behavior begin?

Is she only nervous around the vaccuum or do other loud noises make her nervous? Like thunder storms, motors, etc.?

I have a dog which became very nervous when he heard thunder. He didn't pee, but he shook all over and whined in what we interpreted as terror. In order to sooth him, we would try to console him verbally and stroke him. But the problem only got worse.

I watched an episode of the Dog Whisperer with a dog that had a very similar problem and his solution was to simply ignore the dog. That seemed simple enough, so I tried it and the problem went away in the middle of the very next storm.