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How to not scare a cat
Avoid loud noises.
Cats are frightened by loud noises such as thunderstorms, the vacuum cleaner, hair dryers, power tools and loud voices. When possible, avoid causing a lot of noise or disruptions that will frighten the cat.
For example, have a friend or family member vacuum in a neighboring room while petting the cat. Over time, you can open the door or bring the vacuum cleaner closer to help desensitize the cat and ease their fears.