In the past, when the automobiles and other vehicles were not invented, some animals were used for transportation. Those animals include, donkey, camel, elephant, horse etc. People used to travel from one place to other via horses because it was comfortable and fast way of traveling those days. Not only for traveling, horse was also used for transferring luggage from one place to other.
The first two stanzas described the horse thundering towards outstretched hands being attracted to a field of corn but instead it is attacked by a group of white teenage boys who leave it mutilated. The sheriff of the town does not do anything because he believes that it is in their nature to do so. In the last stanzas the Mexican owner puts the horse out of his misery and someone tries to pay him for. There are lots of breeds of horses in the world!
This includes, but is not limited to, any personal injury or disability the horse Owner, or Owner's guest, may receive on Stable's premises. The Owner fully understands that Stable does not carry any insurance on any horse s not owned by it for boarding or for any other purposes, whether public liability, accidental injury, theft. Then the Horse can no longer compete and make the owner money. The owner then gets rid of the Horse or just leaves it to die.