Lad: A Dog is a 1919 American novel written by Albert Payson Terhune and published by E. P. Dutton. Composed of twelve short stories first published in magazines, the novel is based on the life of Terhune's real-life rough collie, Lad. Born in 1902, the real-life Lad was an unregistered collie of unknown lineage originally owned by Terhune's father. Lad's death in 1918, was mourned by many of the story's fans, particularly children. Through the stories of Lad's adventures, Terhune expresses his views on parenting, obtaining perfect obedience without force, and the nature and rights of the "well-bred". Terhune began writing the stories in 1915 at the suggestion of his Red Book Magazine editor. They gained in popularity and, as Terhune was under contractual obligation to submit something to Doubleday-Page, he collected them into novel form. After Doubleday rejected the novel, he solicited other publishers until it was picked up by Dutton. After a slow start, the novel became a best seller in the adult fiction and children's fiction markets, having been repositioned as a young adult novel by Grosset and Dunlap in the 1960s and 1970s. Selling over one million copies, it is Terhune's best-selling work and the one that propelled him to fame. It has been reprinted over 70 times by Dutton, and republished by a variety of publishers since its original release, including at least six international translations.