On the subject of the NYC carriage horses: [COLOR=0066CC]http://www.veterinarypracticenews.com/Study-Finds-No-Evidence-of-Stress-in-NYC-Carriage-Horses/[/COLOR]
They checked stress markers on several carriage horses on a normal work day and found pretty much no stress, then they checked the horses on their mandatory 5 weeks at pasture per year vacation and found higher stress markers than when they were working daily.
They probably love working so much lol plus being away from their normal handler