Chloe is very afraid of the vacuum. When she was a puppy, she chewed through the cord. We fixed it and she chewed through it in 6 places. She really doesn't like the vaccum. Lucky for her, I don't use the vacuum any more frequently than I absolutely must. Other than the vacuum, she is a pretty fearless dog. Her cousin Jaxun, on the other hand, shakes uncontrollably in fear at fireworks, thunder and other loud noises. (he is not bothered by the vacuum)