Napoleon's Zealotry

In this photo taken during a weekend escapade to the beach, my overzealous Irish Setter Napoleon is charging towards my out-of-screen obese labrador T.J. Napoleon has to work much harder than usual to charge in the water because there is a resistance force to his movement: the water. The reason Napoleon can charge forward is because his limbs are exerting a force greater than the resistant force, and the net force is in the direction he wants to go. One might argue that this is impossible because of Newton's Third Law, for every action there is a equal but opposite reaction. But because of the friction Napoleon's paws have with the sand, Napoleon is able to propel himself forward at a sometimes dangerous speed.