Dogs tilt their heads to better locate sounds. Their floppy or mobile ears can muffle a noise; tilting changes how sound reaches each ear, improving directional hearing.
The tilt may also help them see our faces better by moving their muzzle out of the line of sight — important because dogs read our expressions to understand us.
Some researchers link head-tilting to attention and learning, especially when a dog is processing a familiar word or command.
So the next time your dog tilts at you mid-sentence, they're likely tuning in — both to your voice and to your face.