The dog paddle isn't just for pooches and people who ca't swim. It may, in fact, be an important indicator of how animals developed from land into sea, at least according to one West Chester University professor.
Philly.com has a story about biologist Frank Fish, who studied the leg movements and swimming patters of dogs in order to investigate of water mammals made the transition from land to their natural home.
Don't worry, Fish used some of his own dogs in the study, and all of them are used to water.
Read more about the study on Philly.com.