The Finest Creation — Jean Rabe

They were the Finest Creations - mystically forged creatures of perfection sent by the creators to aid the Fallen (mankind) during their mortal existence.
Though they resemble ordinary horses they are highly intelligent, capable of communicating telepathically and completely moral. They are assigned to bond with individuals of great potential and then protect them from harm while guiding them along a path of virtue.

This is as it has been for years unto creation ... but when a young Finest is separated from its mentor before it has been invested with its assignment, the result of an ambush by evil forces bent on corrupting men, the young equine accepts the charge of two orphans to its care not realizing that man's potential may rest in their future.... And that the path forward is already being diverted by an evil mastermind whose manipulation of court politics and affairs of state might instigate a new dark age upon the light of civilization.