He’s not expressing confusion, he’s tilting his head for better sound localization. While having an ear on each side of the head is good for lateral echolocation, tilting the head so that the ears are offset gives it vertical depth.

doG SCIENCE

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Oh my gosh, that explains why some dogs put their head to one side when you talk to them. They’re not confused, they’re trying to listen to us better. Awww.