Dog Shaking With His Head

Conclusions
The studies suggest that somewhere along the evolutionary line, that most animals learned to shake at an optimum frequency to remove water from their coat. It can now be understood that while most owners hate it when dogs shake water inside their house, that dogs are just performing an automatic survival function.
The study also had the side benefit of having a commercial benefit to Whirlpool who sponsored the studies. They are using the results to assist them in building more efficient washing machines. The study may also assist the design of dryers, painting devices and spin coaters.