Animals know all about joy. They have no reservations in feeling it or in expressing it; their wondrous ability to live in the moment allows them to feel their joy in its fullest, right now. And they all have some way or another of expressing it.
For horses, their best defence mechanism becomes their greatest joy. Horses were born to run and carefully designed for speed and stamina. Their superb muscular strength, long legs, and superior respiratory and cardiac systems make them unique among animals for combining strength, speed and stamina in one glorious package.
And they know it. Make a horse happy, and he’ll express it in exuberant bounds, galloping across his paddock, leaping up into the air with all four legs, rearing with dizzying elegance, or bucking spectacularly just for the sheer wild fun of it.
Horses were made to be horses. They might not know the Lord God Who made them, but they know they were made. For them, that’s enough.