What Is an Appendix Horse?

The Appendix horse is the offspring of a Thoroughbred and a quarter horse. These horses often possess the best traits from each of their parents and make great horses for all types of riders. Because of this unique mix of genes, Appendix horses are very versatile and suitable for many uses. They can also be registered with certain associations that provide very specific rules for eligibility.

  1. Physical Characteristics

    • Many traits that are unique to quarter horses or to Thoroughbreds show up in the Appendix horse. They are medium-sized horses that are neither thick nor lean. They have refined shoulders and withers instead of the bulldog-like frame of the quarter horse, but have shorter legs and backs than Thoroughbreds. However, it is important to remember that the Appendix horse is a mixed breed and various physical attributes will vary by individual. In general, Appendix horses are known to come in a variety of colors, to be taller than the quarter horse but shorter than the Thoroughbred, and to possess refined features on a strong frame.

    What Can an Appendix Do?

    • Appendix horses often carry the best traits from both of their parents. They are often agile and have more endurance than a purebred quarter horse, but are more calm and even-mannered than most Thoroughbreds. Because of this mix of traits, Appendix horses can perform in a variety of disciplines in both English and western styles of riding. They can excel in the hunter-jumper and dressage rings just as easily as they can be surefooted trail horses or fast barrel racers. Appendix horses are capable of many different equine activities and only need a competent trainer to teach them how to perform.

    Registering an Appendix Horse

    • Although Appendix horses are direct descendants of quarter horses on one side of the bloodline, they are not purebred horses. However, these crosses are considered a type of quarter horse and can be registered with the American Quarter Horse Association (AQHA). There are strict guidelines and rules that govern this process. There is a special registry for Appendix horses as well as specific breeding regulations. In order for horses to be eligible for registration, they must be the direct result of a pairing between a quarter horse and a Thoroughbred, or a quarter horse and a registered Appendix horse. When breeding, an Appendix horse can only be bred to a registered quarter horse and not to a Thoroughbred or another Appendix if the offspring is to be eligible for registry.