Dogs are also very sensitive to harmonics that we can't even hear. I had several confusing episodes where in the middle of the night my dog was freaking out and trying to hide. After a while of putting him outside, then in, then outside, etc, I finally discovered that he was reacting to the faint beep that the smoke detector makes every few minutes when the battery is low. It took me forever to track down which smoke detector was making the noise, and over a period of several of these episodes, I discovered smoke detectors in the house I didn't know existed! Clearly the sound was very uncomfortable for him, even though I only heard a small "beep". Charles Neuman
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