Ultrasonography (also called ultrasound or sonography) is a non-invasive, pain-free procedure that uses sound waves to examine a pet’s internal organs and other structures inside the body. It can be used to evaluate the animal’s heart, kidneys, liver, gallbladder, and bladder; to detect fluid, cysts, tumors, or abscesses; and to confirm pregnancy or monitor an ongoing pregnancy. This imaging technique may be used in conjunction with radiography (x-rays) and other diagnostic methods to ensure a proper diagnosis.