that is a great question... bably cuz they have no smell make a big noise so the dogs can't figure it out....I have 2 labs, they run when the vacuum comes out....ha!
I know. I have had several dogs that would just go nuts over the vacuum. My dog now barks at it from under the bed, it must hurt their ears. Maybe they see it as a threat.
The sound wave of the vacuum cleaner is at 80gh and dogs can only tolerate about up to 60gh. In other words, it hurts their ears.
Small Children, Dogs Cats all run from the Vacuum Cleaners (And Noise)...!!
My husband says because they have no soul My dog is scared of anything that moves and makes noise but is not alive!
