Mainly Colts
Arabians.
A Clydsdale is one breed of Draft horse. If you breed a draft horse ro a regular horse, you get what is commonly called a "warmblood", which are heavier than regular horses, but lighter than draft horses.
a yealand pony or horse is a breed of horse
Yes, "Quarter Horse" should be capitalized when referring to the specific breed of horse. It is a proper noun that denotes a recognized breed known for its speed and agility in short-distance races. However, when using the term generically, such as "a quarter horse," it should be in lowercase.
A maiden horse is a horse that has never won a race. There are special races called maiden races that only horses that have never won a race can enter.
Arabians
The breed of horse is a Thoroughbred, it is the horse that the cars are named after.
Jockeys
No a Piston is not a breed of horse.
The largest breed of horse tends to be the percheron but other large horse breeds are drum horse, shire, clydesdale, Friesian, or really any draft breed.
The pony horse
NO, people also like to race Quarter horse, Mules, Arabs and other breeds. No, most common race horses are thoroughbreds, but Quarter horses have also been known to do well. (There are many other breeds that race to.)