An ear infection is the result of a microorganism and microscopic parasites invading and successfully colonizing one or more canals of the ear. Bacteria, yeast and ear mite infections are the most common types. Many conditions can make a pet predisposed to ear infections including allergies, hypothyroidism, Cushing’s disease, autoimmune condition, genetical deformity, growth or tumors, trauma, ruptured ear drum etc. Foreign bodies or trapped moisture from swimming or bathing can also increase the risk of ear infections.