Halley is Colonel Sassacre's dog. Halley's dog house is destroyed by a meteor carrying a baby Grandpa. After Grandpa accidentally shoots and kills Sassacre, Halley acts as the guardian of both Grandpa and Nanna, though Grandpa often says the name incorrectly as Harley due to an odd speech impediment. Years later Grandpa rides Halley off as he goes off on an adventure.

Thirteen years later, the boy develops a taste for adventure. He and his guardian bid farewell.

On Halley's first appearance it was noted that he bears a striking resemblance to Bec, Jade's Guardian. Despite the resemblance, he appears like an ordinary dog and has none of Bec's reality-warping abilities. It was later shown that Halley was used to clone Bec by the Draconian Dignitary using Rose's journals. Andrew stated that Bec is not completely omniscient like some first guardians because of Halley being his genetic source, confirming that Halley himself is just a normal dog.

Halley currently resides as a stuffed corpse on the top floor of Jade's house, beside the stuffed body of Dream Jade. It is not known how he died.

After the scratch young Poppop and Grandma had a dog which was very likely Halley. He was eventually murdered by their adoptive grandmother.

Halley shares his name with a comet.

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