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The characterization of the CVC is key because it helps with clinical integration of information when sonographic striation of the gallbladder is found in acute collapse or weakness in a dog with a previous healthy history (Figure 7.12) (Lisciandro 2014a). In canine AX, the CVC is expected to be “flat” having small maximum diameter with little respirophasic diametrical change because of the severe AX‐related hypovolemia (see Figures 7.12, 36.8–36.12). In contrast, patients with pericardial effusion/tamponade and right‐sided congestive heart failure have a CVC that is expected to be “FAT” having a large maximum diameter with little respirophasic diametrical change because of the severe cardiac‐related hepatic venous congestion (see Figures 7.12, 36.8–36.12). The terms “flat” and “FAT” have been published as terms that similarly characterize the inferior vena cava (IVC) at the subxiphoid view in people (Ferrada et al. 2012a,b). Integration of other POCUS and FAST findings is imperative for accurate interpretation. More information regarding the CVC and its evaluation may be found in Chapters 19, 20, 26, 36, and 37.