The great Overdog
That heavenly beast
With a star in one eye
Gives a leap in the east.
Canis Major  is a constellation whose name means “greater dog” in Latin. Just as the word “God” is capitalized, the capitalization of “Overdog” reflects the dog’s status as a powerful, celestial being. 
 
 Not only does the constellation look like a dog, but it also contains the “Dog Star,”  Sirius , which is the brightest star in the night sky. Frost also refers to this star in his poems  “Bond and Free”  and  “One More Brevity” .
Canis Major