An ultrasound is a diagnostic tool for non-invasive, non-painful scanning of the body systems. This tool allows us to evaluate the architecture of internal organs including the liver, kidney, spleen, gallbladder, urinary bladder, and prostate. Many organs that are difficult to see on X-rays (like the prostate) can be easily seen with ultrasound. Ultrasound scanning has been used to diagnose many disease processes in small animals. An ultrasound exam can also be helpful on pregnant animals to determine the stage of pregnancy and the health of the fetuses. The typical ultrasound examination requires no sedation or anesthesia and is easily performed on awake animals. Prior fasting or water withholding is not required.