Webster's Dictionary 
(n.) The Dog Star. See Dog Star.
The Nuttall Encyclopedia 
he brightest star in the heavens, one of the stars of the Southern constellation of Canis Major ; is calculated to have a bulk three times that of the sun, and to give 70 times as much light. See Dog-Days .
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
a name which occurs in both mythology and astronomy — the dog which stands near Orion in the skies, and which belonged either to that hero, to Cephalus, to Isis, or to Erigone; the dog star.