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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Just thinking about dust almost makes you sneeze.

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So you might think a house with dust and a dog would be a recipe for respiratory distress.

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Well, think again.

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Because a new study shows that exposure to dust taken from a dog owner's home actually prevents allergies and airway infection.

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In mice, at least.

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The findings appear in the Proceedings of the National Academy of Sciences.

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It's been known for a while that early exposure to a furry companion can reduce the risk of childhood allergies and asthma.

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To find out why, researchers treated mice with dust from two homes: one with a canine resident and one was pet-free.

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Turns out the rodents that were sprinkled with dog-imbued dust mounted a less aggressive immune response against a common allergen, cockroach protein.

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Probing a little deeper, the researchers found the dog-dust mice had bacteria in their gut not found in the other mice, including a ton of one species of lactobacillus.

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Exposing other mice to that bug alone warded off an allergic response,

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and even protected them from infection with a respiratory virus.

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So go tell Fido know that he's a good boy.

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Because even if he doesn't fetch your slippers, he's likely contributing to your good health.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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