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A random but fascinating scientific fact about dogs: their sense of smell is so powerful that it's closely tied to their emotional memory (similar to humans with smell and memory). Don't smell what something is, and simultaneously they remember how it makes them feel, which is why they can easily get so excited seeing their owners. It's because the owner's smell is triggering their emotional happiness. Scent information goes straight to parts of the brain connected to emotion and memory, like the amygdala. That's why a dog can become instantly calm, excited, or anxious when they smell a familiar person or place.
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