One of the 88 modern constellations. In Greek mythology, Canis Minor and Canis Major (大犬座) are the two hunting dogs of Orion. The Chinese name is a calque of the Latin: 小 'small' + 犬 'dog' + 座 'constellation'.
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All Western constellation names in Chinese end in 座 ('seat / constellation'): 大犬座 (Canis Major), 狮子座 (Leo), 天蝎座 (Scorpio), etc.