The speaker is celebrating a deep friendship with a horse, though the animal isn't named until the final couplet. Until then, the poem lets us think of a human companion, then gently corrects that picture: this friend has no words and no hands to hold, yet he listens. The speaker's secrets stay untold, and the horse "holds no grudges, no regrets," which suggests a kind of acceptance people don't always offer.
What the speaker feels is gratitude, comfort and pride. The horse's "chocolate pools" of eyes take away sadness, and the line about riding as the ground "turns to dust" hints at speed and freedom. Comparisons like "jewels in a crown" and "the wind in the sky" show how precious and exhilarating the bond feels. The horse can gallop "as fast as a fire" or simply stand quietly beside the speaker.
The mood is warm, tender and a little joyful. The steady rhymes, especially the closing "end" and "friend," give the poem a sincere, affectionate finish.