Although microscopic in size, ear mites are often a major problem for dogs and cats. They cause intense itching inside the ear, irritation and infection if not treated. Symptoms: Dogs with ear mites often scratch at their ears and shake their heads to one side or the other. For this problem we recommend Happy Jack Mitex, an effective pesticide in handy self-applicator bottle. Contains Pyrethrins. Effective pesticidal for ear mites in dogs and cats.