Horse coat shar peis have the shortest and roughest hair or all three types. They also change the most significantly in appearance from puppy to adult. While, as puppies, they're little balls of wrinkled skin, as adults they have mostly smooth skin and a lean, athletic build. As they don't develop an undercoat in the winter, they shed less than other types, but may be less adept in cold weather. They tend to be the most active and intense of the three varieties.