I'm an equestrian, so I can help you out here!
If a horse is afraid (spooked is the proper term) it will flatten its ears, and possibly bolt (gallop away) or rear (stand on it's hind legs).
The horse would most likely flee. That is what they are made for. In other smaller cases though, a horse might fight. For example it might stomp on a snake instead of run away.
Most likely a Quarter Horse.
Most likely an Appaloosa
no. the Arabian was most likely the first breed of horse.
there can be a leader but only sometimes they get afraid
no it is sort of rare to have a black horse. it may look black but most likely it is a dark bay.
No the flat tooth animal is most likely to be afraid
Most likely they are afraid or scared. They maybe cold.
A poem about being afraid of the dark :)
if your meaning coach horse, its a horse that pulls carts and coaches, most likely in cities for tourism
The way you treat your horse influences its behavior. If you are a jerk to your horse, he will either be afraid of you, or he will get angry (depending on the horse). If you treat your horse like a prince/princess, the horse will most likely take advantage of you and boss you around and lose respect for you. *Somebody can improve this answer, my answer is pretty bad haha sorry. Other things that can influence behavior is how tired the horse is, its training, its health, it's age and the temperament it was born with.
It depends where the horse is, but most likely a cougar.