The protagonist of War Horse is quite different than most novels-a horse, Joey. Why might this be an especially difficult challenge for a novelist?

Im my opinion, the biggest challenge would be thinking like a horse. Joey would have far different worries and thoughts.... different loyalties, as well as a lack of understanding in terms of human conflict. Joey would also see danger instinctually..... things like guns and uniforms wouldn't be a factor. Joey would love whoever took the time to care for him..... caring being the operative word.