"A big dog ran by like a shadow...."See in text(The Garden Party)
If we build on the idea that Laura has left the land of light and life for one of shadow and death, then the presence of a large dog immediately calls to mind a key figure from Greek and Roman mythology: Cerberus, the three-headed dog who guards the gates to the underworld. Further allusions to Greek and Roman mythology arise during Laura’s journey, representing strong evidence that her tale extends beyond a mere quest.