Oval gem with the head of Sirius (the Dog Star), Roman, Republican or Early Imperial Period, 1st century B.C.
The star Sirius (Alpha Canis Majoris) has a long association with canines. The Akkadians and Sumerians called it Mul-lik-ud” (“Dog Star of the Sun”), the Babylonians referred to it as Kakkab-lik-ku (“Star of the Dog”), the Assyrian named it Kal-bu-sa mas (“the Dog of the Sun”), and to the ancient peoples of Chaldea, it was Kak-shisha (“the Dog Star that Leads”).
According to theoi.com:
Some say she was Maira a daughter of the Titan Atlas, others that she was Maira the dog of Ikarios, Lailaps the hound of Orion, or Kyon Khryseos the golden-hound of Zeus. She may also have been associated with Orthros (“morning twilight”), hound of Geryon, the giant of the west. The dog-star was probably also associated with the dog-goddess Hekate, daughter of Perses “the Destroyer” and Asteria “the Starry One.”