One of the most endearing quizzical looks I’ve seen is the head tilt of a dog. This seems to be quite prevalent in the German Shepherd Dog, though certainly not unique to the breed.
Folks offer all kinds of explanations for why their dog tilts their head. Many attribute it to a state of semi-confusion—that the dog is really trying to understand what you are saying to or about them. An unusual noise such as whistling can often elicit the head tilt. Another explanation is that the dog is changing the angle of his or her hearing in order to be sure they aren’t missing some important sensory information.
Something everyone agrees upon is that it’s adorable and You Tube is filled with video clips of dogs doing head tilts. Check it out!