The spinal cord acts as a conductor and governs reflex actions. Reflexes are very important to a dog's everyday life. Responsibilities of reflexes include things like blinking or scratching an itch, twitching ears, hair that stands on end and the like. Distemper and rabies can severely damage a dog's nervous system. Get your dog vaccinated regularly against these deadly diseases.
Dogs differ from humans when it comes to the digestive system as well.
No digestion takes place in the dog's mouth as opposed to humans. His starts in the stomach. The digestive system consists of the mouth, which is used only as a passage way, if you will, the esophagus, the stomach, small intestine, large intestine and the rectum. The dog is blessed with strong juices in his stomach to help break down food and bone for easy digestion and to prevent indigestion. The dog's urinary system's purpose is to process and get rid of liquid wastes.