The Last Dog On Earth - Plot

Plot

Logan Moore is a troubled 14-year-old boy living with his mother Marianne and stepfather Robert in Newburg, Oregon. Logan does not get along well with Robert or his mother, and holds a grudge against his biological father for leaving when he was young. After an incident at a barbecue, Robert decides to purchase a Labrador Retriever in order to teach Logan responsibility. Eager to rebel against his stepfather, Logan convinces his mother to adopt a dog from an animal shelter. He plans to choose an ugly dog and teach it destructive behavior. At the shelter, Logan encounters a young female mutt who immediately takes a liking to him. Logan adopts the dog and names her Jack after Robert's former dog.

Meanwhile, a new prion disease named Psychotic Outburst Syndrome (or POS) is affecting dogs, causing friendly pets to become violent. Officials struggle to control the disease and immediately terminate any dogs that catch it. Humans soon begin to contract the disease.

Logan quickly bonds with Jack and values her as his only friend. After getting into trouble whilst attempting to protect her, Logan is sent to boot camp while Jack remains at home. Both he and Jack manage to escape, find each other, and begin traveling together. During their journey, they encounter another dog called White Paws: Jack's brother who has become infected with POS. White Paws attacks Jack and severely wounds her before dying. Logan worries that Jack may have contracted the disease through contact with White Paws. The pair continue their journey until they reach the town of Dayville. Logan faintly remembers that his biological father lives in the town and decides to find his father and confront him.

While Logan is shoplifting food, Jack is found by three men who, fearing that she may be infected, beat her. Logan is arrested and manages to find his father's address at the police station before escaping. He returns to find Jack nearly dead and carries her, attempting to find his father's house, until he faints from exhaustion. He awakens in the house of his biological father, Dr. Craig Westerly, who had found Logan unconscious by his car. Logan learns from Craig that he had not abandoned him and his mother, but that Marianne had divorced him. Logan fears for Jack's life, afraid that she is infected or will be euthanized. Craig runs tests on the dog and learns that Jack, despite having been in contact with POS, isn't infected: she is immune.

Craig decides to take Jack to a doctor so that a vaccine can be created. During the meeting, Rudy Stagg, a man infected with POS who had been killing dogs in order to contain the outbreak, stumbles into their room. Rudy ignores pleas to spare Jack and shoots at her, but Logan dives in front of the dog and is shot instead. Logan suffers a collapsed lung and falls into a coma. He awakens weeks later and learns that Jack is on life support. He says a final goodbye to Jack before her life support is turned off. Jack's immunity to POS leads to the creation of a vaccine and cure, and Logan is finally able to reconcile with Robert, Craig, and Devon Wallace—a childhood enemy whose dog died due to POS. The novel's epilogue, written as a newspaper article, reveals Logan and his family hold a private ceremony to honor Jack.