Many dogs hate or are afraid of vacuums. We have a built-in vac and the other day, I introduced it to the 4.5-week-old pups in as gentle and slowly a manner as possible. Most of the pups weren't bothered by it; a few were curious. Since I was trying to video with one hand and push the vac with the other, the video isn't great but it does give you an idea of the puppies' reactions and all the socialization they are getting.