Orthrus (Orthros) or Orthus (Orthos) (Greek: Ὄρθρος; Ὄρθος) was a two-headed dog in Greek mythology. == Mythology == Orthrus is a two-headed dog who is a doublet ("brother") of Cerberus, both whelped by the chthonic monsters Echidna and Typhon. He was owned by the three-bodied giant Geryon. Orthrus and his master, Eurytion, were charged with guarding Geryon's herd of red cattle in the "sunset" land of Erytheia ("red one"), one of the islands of the Hesperides in the far west of the Mediterranean. Heracles eventually slew Orthrus, Eurytion, and Geryon, before taking the red cattle to complete his...