The skin is the bodys largest organ and healthy skin is essential to your dogs well being skin has many functions it is a protective barrier which prevents the body from drying out and shields it from harmful bacteria and external injuries it stores vital fats and vitamins and is also an important part of the bodys sensory system if your dog suffers from skin irritations and itching dry skin greasy fur or dandruff it is a warning sign that something is not quite right it can affect you