Some Horses is a term used to describe six different breeds of horses. Arabs are a breed of horse known for their endurance and speed, and are often used in racing. Trotters are a breed of horse used for harness racing, and are known for their ability to trot at high speeds. Roans are a breed of horse characterized by their reddish-brown coats with white hairs mixed in. Nags are an old-fashioned term for any horse, usually used in a derogatory way. Mares are female horses, and are often used for breeding. Pacers are a breed of horse used for harness racing, and are known for their ability to pace at high speeds.