28 Feb '12, 9am

Ever wondered how dogs can walk barefoot in the snow? A Japanese scientist may have found the answer

TOKYO - Ever wonder how dogs can walk barefoot in the snow? Now a Japanese scientist may have the answer - an internal central heating system. The secret lies in how dogs circulate their blood to prevent cold surfaces from chilling the rest of their bodies, according to Hiroyoshi Ninomiya, a professor at Yamazaki Gakuen University, just west of Tokyo. The system uses warm, oxygenated blood to heat the cold blood that has been in contact with a cold surface before returning it to the dog's heart and central circulation. "Dogs exchange heat at the end of their legs. Arterial blood flows to the end of their legs and then heats up venous blood before returning it to the heart," Prof Ninomiya said of his findings, published in the journal Veterinary Dermatology. "In other words, they have a heat exchange system in their feet." Prof Ninomiya studied a preserved dog's leg under a...

Full article: http://www.todayonline.com/Science/EDC120228-0000138/Dogs...

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