Neuropeptide arginine vasopressin (AVP) is known to modulate social behavior in several species. The AVP and its receptors are broadly distributed in the limbic system, with several studies documenting their involvement in behavior regulation. However, the role of AVP in feline behavior is unknown, due to lack of studies and possible species differences. Here, as the first step, we investigated the presence of AVP in the domestic cat amygdala by using immunohistochemistry on freely‐floating brain tissue sections. The amygdala is an important component of the circuitry underlying social behavior and emotions. Therefore, we also characterized the neuronal morphology of domestic cat amygdala using cresyl violet stained 30μm serial sections. Our results show the presence of AVP immunoreactive neurons in the domestic cat amygdala (4 males, 1 female). The average neuronal diameter was 10.7±0.3μm in the lateral nucleus, 14.2±0.6μm in the medial nucleus, 11.1±0.8μm in the central nucleus, and 14.3±1.4μm in the basal nucleus, within the amygdala. The rostrocaudal length of the amygdala ranged from 6.7 – 7.3mm (3 males, 1 female). Variations in neuronal diameters did not translate to AVP immunoreactivity. This study is the first demonstration of the presence of neuropeptide AVP in the domestic cat amygdala. This might suggest a potential role of AVP in regulating social behavior in domestic cats. The morphometric findings of neuronal diameter might complement the physiological findings, implementing different roles in behavior for different subnuclei. Such studies will lay foundation for future research in feline behavior to improve feline health and welfare.Support or Funding InformationWestern University of Health Sciences, Pomona, CA