I know everyone here loves the Arabian horses, but my favorite is the dark bay Turkoman! And you can get one in chapter 3 (or by using cheats any time) by using
Red Dead Redemption 2 BEST Horse: How to get White Arabian, Missouri Fox Trotter, Turkoman - Daily Star
Turkoman at Red Dead Redemption 2 Nexus - Mods and community
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Red Dead Redemption 2: Everything You Need To Know About The Turkoman Horse Breed
How to get Red Dead Redemption 2's best horses early, for free
Red Dead Redemption 2: Horse Breeds Silver Turkoman - YouTube