Mrs. O'Leary

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Do-Gooder
Full Name	Mrs. O'Leary
Alias(es)	No information
Origin	Percy Jackson & The Olympians
Occupation	Percy Jackson's pet hellhound
Powers / Skills	Shadow Travel
Hobby	No information
Goals	To aid Percy
Family	No information
Friends / Allies	Her first owner Daedalus Her current owner Percy Jackson Annabeth Chase Nico di Angelo Charles Beckendorf † Rachel Elizabeth Dare Tyson Chiron Other Camp Half-Blood campers
Enemies	Kronos Luke Castellan Kelli Titan Army
Type of Hero	Animal

Mrs. O'Leary is a supporting character in The Camp Half-Blood Chronicles, making her first appearance in the first series Percy Jackson & The Olympians in it's fourth book "The Battle of the Labyrinth".

She is the pet Hellhound of Percy Jackson. In the Camp Half-Blood universe, hellhounds are usually enemy creatures, and almost always against the protagonists. However, Mrs. O'Leary happens to be extremely nice.

She was at first a pet of Daedalus, but after his death, she was passed onto Percy. Whenever Percy was away from Camp Half-Blood she was in the care of a demigod son of Hephaestus named Charles Beckendorf until his death. In the second series The Heroes of Olympus, she comes back, always as helpful. Percy can call her whenever he pleases.