Ultrasonography has become an important imaging modality for the evaluation of small structures, such as adrenal glands, because it is relatively inexpensive, it is non-invasive and it does not require general anesthesia. Both normal and abnormal small structures can be seen, though this depends to a great extent on the quality of the equipment and the operator skills. Adrenal glands of normal and hyperadrenocorticoid dogs were examined ultrasonographically and results discussed.