Buddy is not afraid if the vacum at all!! If he's laying down on the floor when I'm vacuming, I have to push him out of the way!
(thunder, fireworks or gun shots... now that's another story!)

Sierra on the other hand, she acts like one has tried to EAT her before!! She acts like it's going to attack her!!!! She can't get far enough away fom me when I'm using it!
(She's the same way with the riding lawn mower and plactic bags)