In everyday work in small practice we very often encounter symptoms related to the primary pathology of the digestive system of dogs and cats. Digestive symptoms themselves are often nonspecific. For this reason, during the diagnostics, in addition to clinical examination and laboratory tests, ultrasound and X-ray examination are of great use here. One of the significant advantages in comparison with other diagnostic imaging methods is the noninvasiveness of ultrasound, and thus the possibility of frequent repetition of the examination. In many conditions where it is necessary to assess the functional state of the digestive tract and get a more detailed insight into the picture of anatomical details, ultrasound is the first method of choice. Regardless of some difficulties in performing diagnostic ultrasound in most patients we can visualize dilatations, foreign bodies, obstructions, diffuse and localized structural changes, functional disturbances, intussusception, inflammatory or neoplastic changes. Ultrasound findings of similar conditions very often differs depending on the localization within the gastrointestinal system. In any case, modern veterinary medicine emphasizes the advantage of use and superiority in the degree of detection of changes in ultrasound diagnostics over some widespread radiological methods.