 The Maine Coon has since made a comeback and is now one of the most popular cat breeds in the United States.The Maine Coon is a large and sociable cat, hence its nickname, "the gentle giant".It is characterized by a prominent ruff along its chest, robust bone structure, rectangular body shape, an uneven two-layered coat with longer guard hairs over a silky satin undercoat, and a long, bushy tail.