When dogs show the whites of their eyes in a "half-moon" shape it can indicate stress. Kristina Stas/iStockphoto.com hide caption

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Let's Not Hug It Out With Our Dogs
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Luna, a German shepherd-husky mix, survived in the wild for five weeks after swimming 2 miles to shore when she fell off her owner's fishing boat. U.S. Navy - Naval Base Coronado Via Facebook hide caption

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Kelli Fabick of Ellisville, Mo., held her mother's Australian silky terrier, Zoey, as veterinarian Sarah Hormuth gave the dog a flu shot last April. The dog flu strain H3N2 is now circulating in more than two dozen U.S. states. St. Louis Post-Dispatch/TNS via Getty Images hide caption

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Dog Flu Virus Spreading Across The United States
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Rod-shaped specimens of Yersinia pestis, the bacterial cause of plague, find a happy home here in the foregut of a flea. Fleas can transmit the infection to animals and people, who can get pneumonic plague and transmit the infection through a cough or kiss. Science Source hide caption

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Small Plague Outbreak In People Tracked To Pit Bull
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Andrew Dickerson On 'All Things Considered'
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