Terry Polaski is a disabled Marine trying to avoid a medical discharge. When his wife brings home a stray Border Collie, Duke, Terry quickly falls in love with the intuitive animal, and the two become fast friends. Ten years later, Duke and Terry are homeless when Duke suddenly falls desperately ill. Terry fears that Duke has suffered a stroke and leaves him on the doorstep of a vet clinic with a heartfelt note asking for the veterinarian to please help him sleep. The vet is moved by Terrys letter, and her team nurses Duke back to health. They start a campaign to locate Dukes owner, including lawyers and newspaper articles. Terrys daughter, Alice, sees the article, and realises that her long lost father is still alive. She locates him and helps him retrieve Duke from the clinic. Alice, Duke, and Terry are re-united, and happy to have a second chance to share each others lives.