Ultrasound is a useful tool for evaluating the gastrointestinal tract in dogs and cats. It allows visualization of the wall layers, assessment of motility, and detection of abnormalities. The normal GI tract shows five distinct wall layers, while diseases may cause wall thickening, loss of layers, or abnormal masses. Ultrasound can identify many intestinal disorders and replace the need for contrast studies in some cases. Proper technique involves scanning in various positions and using high-frequency transducers to provide clear images of the GI anatomy and any abnormalities.