Gandalf and Shadowfax
The Lord of the Rings series (2001-2003)

We'd be remiss not to mention Gandalf's friendship with the eagles as well, but his horse, Shadowfax, is the wizard's true companion. "The Lord of all Horses," Shadowfax is one of the Mearas, the greatest horses in Middle-earth. He understands Gandalf and they can communicate over long distances.

Originally gifted to the wizard by King Théoden, Gandalf tamed and bonded with him before the two embarked on their adventures together. They're the light in the darkness.