My dog doesn't even notice them if hte door is closed. When we opened the screen door last night cause it was hot, she got mildly interested in the louder ones (Just looking out the door). But it seemed more she was curious than scared (in fact it looked like she was thinking maybe something interesting that I should go partake in is happening outside). In fact show when there was chance of finding fallen food from our meal or chance I might give her a treat that was way more interesting to her.