Chasing vacuums cleaners

I do not know what it is with vacuums and dogs. You can have a quiet dog playing by himself, but turn on a vacuum and the scene changes. Chasing the vacuum seems to come so naturally to dogs. Our last Westie did not mind vacuum cleaners, he chased brooms. It took patients and training for our last Westie. We know Zachary will eventually co-exist with the vacuum, just not today.