We described the dynamic mechanical properties of the passive pharynx in Vietnamese pot-bellied pigs and the effects of caudal tracheal displacement. During general anesthesia and neuromuscular blockade, airflow through the upper airway () and pharyngeal cross-sectional area were measured during ramp decreases in pressure downstream from the pharynx (Pdown). Measurements were made with 0, 1, and 2 cm of caudal tracheal displacement. Airflow limitation and/or negative pressure dependence (NPD) were observed in all animals. Tracheal displacement (2 cm) increased maximal (_max) by 205.1 ± 105.1% (P < 0.05) relative to the value with no displacement and increased the magnitude of NPD, expressed as percent decrease in from _max, from 22.9 ± 27.4 to 56.6 ± 37.5% (P < 0.05). Initial decreases in Pdown narrowed all levels of the pharynx, but, once _max was reached, further decreases in Pdown narrowed the hypopharynx but not the nasopharynx and oropharynx. We conclude that the hypopharynx is the flow-limiting site in the pig pharynx. Tracheal displacement not only improved airflow dynamics as _max increased but also resulted in pronounced NPD.