Dog Shaking With His Head

The core reason behind this vital action is to remove excess water from their coats so they do not get hypothermia. Scientists calculated that without devising the shaking behavior to remove the water that up to 25 percent of an animals daily calories would be required to heat their bodies. In lean times this excess energy burn would potentially lead dogs to starving to death.
The studies also show that shake speed varies depending on dog size and skin looseness.