The following breeds of horses start with S:
appaloosaFamousRider from Horse Isle
The Barb horse, Belgain, russion Budenny, .....
appaloosa
The Friesian Horse. Black with very little or no white markings.
Arabian fits your criteria.
Kathiawari, Kerry Bog Pony, and Knabstrupper
sea horse!
No a Piston is not a breed of horse.
The breed of horse is a Thoroughbred, it is the horse that the cars are named after.
a yealand pony or horse is 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.
Two breed of horse that start with M are Mustang and Morgan