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Izzie was the Petrelli family's dog.
At Arthur's funeral, Nathan tells Peter that Arthur is with Izzie now, and reminds him how much Arthur hated the dog. Peter explains that Izzie was the only living thing that ever disobeyed Arthur. Nathan remembers when they were kids and Arthur would sit outside their home and watch Izzie bury bones.
Right before he is killed, Arthur remembers the moments that defined his life, including memories of Izzie.
- In Kindness of Strangers, Nathan looks at some photographs of Peter: one in which he's holding a small brown and white dog in his arms, and another in which he's kneeling with a large dark dog at Christmas. Another photo from .07% shows a framed photo of a dog. It is unknown whether or not any of these dogs is Izzie.