One of my dogs, Sammy (a shih-tzu & pomeranian mix) is afraid of the dumbest things.
When I get out the vacuum - he follows it around from room to room. No fear. When I mow the lawn with my loud push mower, he sits on the deck and watches the entire time. No fear. When I trim the lawn with the electric weed eater, he follows me around. Still no fear.
But heaven forbid I get out a tiny little pill bottle! He hears the rattle and runs like the wind.