Fur of dogs and other mammals dries due to rapid oscillation that sheds droplets efficiently.

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"The drying of wet fur is a critical to mammalian heat regulation. We investigate experimentally the ability of hirsute animals to rapidly oscillate their bodies to shed water droplets, nature's analogy to the spin cycle of a washing machine. High-speed videography and fur-particle tracking is employed to determine the angular position of the animal's shoulder skin as a function of time. We determine conditions for drop ejection by considering the balance of surface tension and centripetal forces on drops adhering to the animal. Particular attention is paid to rationalizing the relationship between animal size and oscillation frequency required to self-dry." (Dickerson et al. 2010)

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Andrew Dickerson and colleagues at the Georgia Institute of Technology drenched 27 animals (including a lab mouse, six different kinds of dogs, and a tiger from Atlanta’s zoo) and filmed the animals, at up to 1,000 frames per second, shedding the water. They discovered that shaking speed relates to body size and can be described with a simple mathematical model. The new insights into animals’ shaking could be used to develop more efficient washers, dryers, painting equipment, and spin coaters." (Doermann 2011)

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A better spin cycle: more-efficient washers and dryers inspired by dogs

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