Quote Originally Posted by Arctic Cyclist View Post

Unless it's spooked and panicking there's no reason for a horse of that breed and health condition to die from a ride like that. Arabs, Berbers, or any other breed descended from the Turkomen horse aside from Thoroughbreds should be just fine with a fifteen hour ride through the desert. Even the non working ones still excel at hundred plus mile rides over a short period of time in extreme conditions. Ones like Bruce and Selina rode, just like the ones Dick and Damian showed up on, would have come from a stable that specializes in endurance bred racers.
You don't seem to have taken weight into consideration. I'm not a horse expert, but from my understanding, Bruce and Selina, plus their clothing and equipment--easily more than 350lb, probably closer to 400lb--are way too heavy for a normal horse.