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Mrs. O'Leary has a biographical information about the gender of the Hellhound.She is believed to be the only friendly hellhound.
The descendants of Hellhounds are Elpis, Hemera, Eris, Furies, Keres, and Aither.
Mrs. O'Leary was born in the area.She was originally a pet.They became very close after he tamed her.The story of how he got Mrs. O'Leary involves a lot of close calls with death.
Mrs. O'Leary is at Camp Half-Blood with her owner.When he first sees her, he attacks her but is stopped by her owner, who wouldn't allow anything to happen to his pet.Mrs. O'Leary is friendly and sweet, and she plays with a shield as a frisbee and a combat dummy to play fetch.When Percy is about to enter the labyrinth, Quintus gives him a whistle made of Stygian Ice, so if he ever needs help, he could use it to call Mrs. O'Leary.
The whistle was used to call Mrs. O'Leary for help, but she vanished after they fled.Mrs. O'Leary found her way back to the location where the labyrinth was originally built.They fled when they were attacked by the monsters, but Quintus wouldn't let his pet go.They made it out and joined the Battle of the Labyrinth.Mrs. O'Leary was left in Percy's care after Daedalus passed on.
Mrs. O'Leary was left in the care of Charles Beckendorf who forged her a collar, a toy, and other useful items.
The Mist made everyone believe that Mrs. O'Leary was a poodle when she arrived in the middle of the English exams.He followed her into the park and came across Thalia Grace and the others who were taken to the Underworld.Mrs. O'Leary tried to warn him, but he was too late.
Mrs. O'Leary is happy to see him at camp.Beckendorf, who died a few hours ago on the Princess Andromeda, would take care of her when she was away for a quest or vacations.Beckendorf welded Mrs. O'Leary's collar and chewing bone.Pushing the sad thought away, he followed her until he found her.The others were afraid of dogs, so the hellhound was taken for a walk.The two of them will go to the mother's house.Mrs. O'Leary uses shadow travel to get around.Hestia gave Mrs. O'Leary a large dog treat after the meeting.The hellhound takes a nap due to shadow traveling.
The group was able to get to the Underworld with the help of Grover.The Furies came to collect them.After they escape, she transports them to the River Styx, where they can receive the curse of antarctic.
Mrs. O'Leary was injured fighting the Drakon in the Battle of Manhattan.She takes an injured Chiron back to camp after getting a message from Percy.After facing a hellhound, Percy hesitated to kill it.He reminded himself that this wasn't Mrs. O'Leary.This is not a normal monster.It will kill me and my friends.
In one of his dreams, Tyson is riding her as they look for him.When he and his friends are near Camp Jupiter and she helps them haul tons of Imperial Gold and fight in the battle, they whistle for her.After the battle is over, she says how she has finally found a playmate who she can rough-house with.
Tyson was first seen among the mob in New Rome, being carried into the city by Mrs. O' Leary.She later enters the Forum and rests on her back.Tyson was told by Percy to take Mrs. O' Leary and Ella somewhere else.He told Tyson to take her to Camp Half-Blood.The group was told that Tyson and Mrs. O' Leary had arrived safely.
Mrs. O'Leary was mentioned by someone.During the fight with the empousai, he considered calling her for backup, but decided against it as he was worried that Tartarus could have a negative effect on her.She did not show up.
When he arrives at Camp Half-Blood, he uses Mrs. O'Leary to shadow travel to the top of the Colossus's head.Mrs. O'Leary freaks out as she isn't fond of heights and pees on the Colossus.They distract it and lure it into the ocean.The giant statue is defeated by a plague arrow and falls towards the group.Mrs. O'Leary shadow travels away so that she doesn't get crushed.