To "back" a horse means to bet on it. If you back the wrong horse, you're betting on a loser. In business, this often means that you have sided with the wrong person.

Find out who has the horse and sue them if they did something wrong .O

No, there is nothing wrong with owning a horse.

The Beautiful Horse is about two American cousins that steel a horse and keep it to ride. In the end, they realize that their family is honest and steeling is wrong, so they give the horse back to the rightful owner.

what's wrong with the horse?