Canis Minor, en castellano Can Menor (el perro pequeño) es una de las 88 constelaciones modernas. Formó parte también de forma evidente de las 48 constelaciones primitivas del Almagesto de Ptlolomeo, dado que se encuentra incluida en la fuente de este último trabajo: la gran obra denominada Astronómica de Manilio de Antioquía. La figura del Can menor es simple: una línea que une dos estrellas. Procyon su estrella más brillante forma junto con Betelgeuse (Orión) y Sirio (Can Mayor) el «Triángulo de Invierno».

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Canis Minor /ˌkeɪnᵻs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for "lesser dog", in contrast to Canis Major, the "greater dog"; both figures are commonly represented as following the constellation of Orion the hunter. Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.

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