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The evolutionary reason behind puppy dog eyes, and more pup trivia you may not know

By Linda Lombardi of Stacker | Slide 2 of 51: A dog's sense of smell is more sensitive than that of humans. A dog's nose contains around 800 different types of olfactory receptor cells, which is about twice as many as in humans. The olfactory bulb, the part of the brain that processes smells, makes up 1.95% of the volume of a dog brain but only 0.03% of a human brain.

Dogs are built to smell

A dog's sense of smell is more sensitive than that of humans. A dog's nose contains around 800 different types of olfactory receptor cells, which is about twice as many as in humans. The olfactory bulb, the part of the brain that processes smells, makes up 1.95% of the volume of a dog brain but only 0.03% of a human brain.

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