All three of mine are 'scared' of it.. maybe more annoyed than scared though. They all get up on the couch when I vacuum the living room. Or when I'm upstairs, they just go in different rooms or stand on the bed and watch. Bunny really hates the hose though.. when I take that off to clean small areas she goes nuts. But I figure thats because she has aggression issues. So I don't really know.. the treat when he walks by it idea seems logical. Id bet that'd work well, over time. Eli did used to run from it when he first got here, but he has gotten used to it I believe. So Im with the others, I think it just takes time, and he'll get used to it.