Ultrasound is a diagnostic imaging technique similar to radiography (X-rays) and is usually used in conjunction with radiography and other diagnostic measures. It allows visualization of the deep structures of the body.

Ultrasound can be used for a variety of purposes including examination of the animal's heart, kidneys, liver, gallbladder, bladder etc. It can also be used to determine pregnancy and to monitor an ongoing pregnancy. Ultrasound can detect fluid, cysts, tumors or abscesses.