The purpose of the work - to identify patterns of changes in the morphofunctional organization of the vascular bed of the liver at different stages of development of strangulational and obturating acute small bowel obstruction (ASBO). Material and methods. The study was performed on 33 adult mongrel dogs of both sexes weighing 17-20 kg. The morphology of the liver in normal was studied on 2 (two) of those dogs. Twelve animals were simulated with a strangulational ASBO. In 12 animals, a low obturating ASBO was simulated. A morphometric method was used to assess the change in the volume of the vascular bed in terms of the degree of change in the area of the vessels per unit area. Results. In the dynamics of the development of the disease, we revealed patterns of changes in the morphofunctional organization of the vascular bed of the liver. Conclusions. In the process of formation of obturating ASBO, in spite of the absence of clinical manifestations of acute intestinal obstruction, the emergence of a basis for the development of polyorganic insufficiency has already been observed from 2 days.