In one year old dog was diagnosed hypothyroidism. The treatment lasting for two months was finished as a result of an owner's decision. He changed the veterinarian and we haven't had any information about this dog for a long time. The patient appeared in our office again in the age of five years. Dog was suffering from an extensive alopecia, pendulous abdomen, polydipsia, polyuria and calcinosis cutis as a result of prolonged corticosteroid administration (0.9 mg/kg SID for a period of three years). The result of this treatment was iatrogenic Cushing's syndrome.