The real owner
The vet told the Andersons that the CEO was offering a big reward to anyone who found his special horse. The vet assured the Andersons that he vouched for them to the police so they were not in any trouble at all. They would probably be questioned though when the cops arrived.
Source: Vibrate World
When the cops arrived, they were with the CEO. He sat with the Andersons and provided proof that Shadow did belong to him. The horse’s real name is Treasure and there was no use arguing. The treasure was a rare choice and it’s not like there are other blue-eyed horses around town.