Maine Coon cat breed. The Maine Coon, also known as American Longhair, is a breed of domestic cat with a distinctive physical appearance and valuable hunting skills. The Maine Coon is noted for its large bone structure, rectangular body shape, and long, flowing coat. The breed can be seen in a variety of colors and is known for its intelligence and gentle personality. They are playful throughout their lives, with males tending to be more clownish and females generally possessing more dignity, yet both are equally affectionate.