Did you ever notice that training saddle skirts are long? They are usually 28-29 inches. If these saddles swallow up your horse because of a short-coupled back, you might have a hard time finding a training saddle that doesn't interfere with your horse's hip motion. Here's some good news for you : Rocking R Saddlery has designed a training saddle specifically for the short-backed horse. Their model 2387 Trainer is only 26-1/4" for the 15" seat, 27" for the 16" seat, and 27-3/4 for the 17" seat. It's a high quality saddle that offers a little more style than the typical all-roughout trainers.
For more details, check it out here: Rocking R 2387 Training Saddle