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Why do dogs tilt their head to the side?

Ask your dog if they want to go to the park, and you might get an inquisitive-looking head tilt in response. “In humans, when you remember a story or something, you tilt your head to the side, and you have this mental image of something in your mind,” says Andrea Sommese, an animal cognition researcher at Eötvös Loránd University in Hungary and lead author of the study. Many animals tilt their head as they encounter the sights, sounds and smells of the world.