Probably many would like to know who are friends of the horse. Why do they find a common language almost with all living beings. Why, as the nature of the victims converge with predators, in particular cats and dogs.
Why, knowing their power, inferior to us humans, although we are much weaker than them. With what is friendliness? Apparently, horses are multilingual. They understand the language of those animals that live near them. And those little horses, even had a race with a dog.
The friendliness of the horses laid by nature, for an animal that cannot settle down in the herd (society) because of the aggressive nature will simply not be able to survive and produce offspring. But in human society we try to avoid aggressive people.