Why is my dog afraid of the vacuum?
Dogs are afraid of the vacuum simply because they are afraid of it. It is like a stranger living in the closet, who comes out randomly, makes a lot of noise, moves around and then hides again. It is loud and unpredictable! You need to help your dog understand that the vacuum is not a threat by doing some conditioning and desensitization techniques. Check out WDMD for step by step instructions.
My dog vs. Vacuum:
As a dog owner, one thing that you have to realize is that unfamiliar things are going to scare your dog. It does not matter what it is. You could put on a funny hat and it can scare your dog. If your dog is never around children, they might scare him. That is why it is so important to make sure that you introduce your dog to as many different things as possible. This way he will be comfortable with everything. A note though, you want to introduce them slowly (or at your dog’s comfort level) so as to not overwhelm your dog and actually do the opposite and accidentally terrify him!