Burcardo and the Beast

If we transport livestock over the roads today, could it be possible that aliens did too, when we humans were in our wild west period of development. What if, it were true, and one alien cargo ship broke down around earth, suffered a malfunction, and a weird animal creature catapulted to earth in a broken containment cell. Now, imagine, if it was found by the most contradicting of outlaws in the west, with a shady past, and a wicked sense of personality yearning for redemption. Now, pretend the aliens are forbidden to enter earth, to retrieve the animal, because of a law in the galaxy. A law that prohibits interaction with developing intelligent species, otherwise thought of as human beings. In the time of the wild west, this is one of those stories that never happened. Or, did it?