TV Dog Star LASSIE is a fictional character created by Eric Knight in a short story published in 1940. She is a female Rough Collie dog, and is featured in novels, movies, television shows, and other media. LASSIE is best known for her fictional adventures with her human family, the Martins, and her bravery and loyalty. She has become an icon of courage and loyalty, and is one of the most recognizable animal characters in the world.