Vacuum cleaners make weird noises. Their use involves a person thrusting the thing around the room in gestures that wouldn't make any sense to a dog. The concept of cleaning a floor, other than by eating any food spilled on it, would also be foreign to a dog's way of thinking. There's not much about a vacuum cleaner for a dog to like! The occasional herding dog will chase it because it moves, and some dogs will attack or threaten it because it isn't acting right! ?
Some dogs are some aren't. My dog doesn't mind the vacuum cleaner at all. I'm always telling him to move when I'm cleaning or I'd have to run over him.
Not all dogs are afraid of vacuum cleaners. One of my dogs runs away and I have to move the other two out of the way when I vacuum, they just sit there. Either that or I have to vacuum around them.
A vacuum is just a loud new object. Dogs don't know what it is, all they know is that there is a big growling thing in the house.
