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A dog’s sense of smell is up to 100,000 times more acute than ours. Dogs “smell in stereo”, with each nostril splitting into two parts, one for smelling, and one for respiration. Scientists say that if you can detect a teaspoon of sugar in your coffee, a dog could detect a teaspoon of sugar in a million gallons of water, or two Olympic-sized pools worth of water. Another scientist made the analogy of a dog being able to catch a whiff of one rotten apple in two million barrels.

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A dog has 300 million scent receptors in his nose, and a human has only 5 million. Not only does a dog have 295 million more scent receptors than us, but relatively speaking, the part of the dog’s brain that is dedicated to analyzing these odors is proportionally 40 times greater than ours.

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​​​A Dog's Amazing, Incredible, Fascinating Sense of Smell 

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A dog’s nose is capable of smelling in parts per trillion. To make an analogy to our vision, what you and I can see at 1/3 of a mile, a dog could see at more than 3,000 miles away, and see just as clearly.

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