LOOK up into the sky for a vision of celestial canines. On view this month are four canine constellations, says Joe Rao, skywatching columnist on Space.com. Keep an eye out for sparkling Sirius, the "dog star," the brightest star of the constellation Canis Major (Latin for Greater Dog). Procyon, known as "Little Dog Star," is one of two stars that make up Canis Minor (Lesser Dog). It rises about 20 minutes before Sirius. Finally, look for the Hunting Dogs (Canes Venatici), Chara and Asterion, which, according to myth, were placed in the sky to assist Bootes, the Bear Driver, as he pursues Ursa Major (Great Bear).