Dog ear mites usually live in the head of affected pet but can sometimes live on the body as well. They are contagious and the presence of these dog ear mites can cause severe inflammation. Dog ear mites are not the only cause of hearing area disease in cats and canines. Your pet should be examined to determine if they are present prior to treatment. Whenever treatment for this condition is not working well other causes should be considered. . They cause intense itching inside, irritation and infection if not treated. Although microscopic in size, dog ear mites are often a major problem.