Red Dead Redemption 1, released in 2010, marked a new direction for the Red Dead franchise and introduced a number of new and improved mechanics – including a greater focus on horses. The game's predecessors, Red Dead Revolver and Red Dead Redemption: Gunslingers, included horses and some horse riding, but not to the extent that's utilized in later games.
https://screenrant.com/red-dead-redemption-every-horses-ranked-worst-to-best/