It is bad to kill animals.
Joe trains, raises and cares for horses involved in professional horse-racing and one of his horses becomes injured in a race.
Joe needs to figure out what to do with the injured horse.
Joe decides to retire the horse and put it through physical therapy.
Joe decides to put shoot the horse and ship it to the glue factory.
Joe is happy that he seems to be making a positive impact on the horse's health.
Joe is haunted by the horse's final moments and is depressed.