Like other carrion eaters - e.g., vultures - dogs, wolves, and jackals were associated with funerary customs. Dogs carried the dead to their Mother.
The dog, because of its faithfulness, denotes the relationship which should exist between disciple and master or between the initiate and his God. The shepherd dog was a type of the priestcraft. The dog's ability to sense and follow unseen persons for miles symbolized the transcendental power by which the philosopher follows the thread of truth through the labyrinth of earthly error. The dog is also the symbol of Mercury. The Dog Star, Sirius or Sothis, was sacred to the Egyptians because it presaged the annual inundations of the Nile.
The dog was a seminal symbol in early Irish myth.