Doppler ultrasonography has been becoming an essential tool in veterinary medicine, especially in theriogenology. It has being widely used for the evaluation of fetal well-being in pathologic pregnancies in human medicine. The paper highlights the usage of Doppler ultrasonography in veterinary obstetrical pathologies with a review of literature of human and veterinary medicine. Four cats with dystocia and their fetuses were evaluated for fetal and maternal hemodynamics. As a conclusion, flow velocity of the fetal and feto-maternal vessels can inform us of the existence of the pathology related to gestation and also can help choosing the method of treatment in veterinary medicine.