The Last Olympian Who is Mrs. O'Leary from The Last Olympian and what is their importance? Asked by bookragstutor 13 years ago 10/25/2012 12:55 PM Last updated by anonymous 12 years ago 9/27/2013 12:56 AM
Mrs. O'Leary from The Last Olympian is a Hell hound Percy inherited and is very loyal to Percy. She is the size of a semi-truck to boot.
