Undead horse

An  is a type of horse found in the Red Dead Redemption DLC Undead Nightmare.

Characteristics
Any horse the player owns can become an undead horse. All the player must do is allow their current horse to die; when the dead horse is whistled for, it will return as an undead version of itself.

Undead horses are much faster than their living counter parts. and, much like the Four Horses of the Apocalypse, they have infinite stamina. However, the undead horse is much harder to control than any other horse and, during riding, the undead horse will allways steer south, making riding difficult. This can be counteracted by always pushing the thumbstick hard in the direction you want to go. (Xbox 360 Confirmed)

Trivia

 * This horse may be R*'s response to the popularity of the Dead Horse, which used to be only available through either a rare glitch, or hacking.
 * Undead horses actually have slightly more speed than its living breed. If you find an Undead Painted Horse, its speed will be much higher than a normal Painted Horse, but will be slightly slower than say, an Undead American Standardbred.
 * It is currently unknown what undead horses can be looted for.