High Quality Content by WIKIPEDIA articles! The Last Dog on Earth is a 2003 young adult novel written by Daniel Ehrenhaft. It follows Logan, a lonely 14-year-old boy who adopts a dog from an animal shelter and names her Jack. The pair`s relationship is soon threatened by an incurable prion disease spreading across the nation. Infected dogs become unnaturally violent and bloodthirsty, culminating in the deaths of several people. As public fear heightens and the government intervenes to control the outbreak, Logan struggles to reform his life and remain with Jack.