
If the 2014 Near Year's event would be considered canon (not everyone considers the holiday events to be canon because of how SE counts time), one of the reasons we don't have horses in Eorzea is because the Elementals have forbidden them from the Shroud. To the point where in one dialogue, it was hinted (my interpretation, at least ) that bringing a horse there could get someone some measure of Greenwrath.Â
Beyond that, though, horses just aren't native to Eorzea. The GC ones from PvP were 'purchased from the Far East' (from the same NPC that was introduced in the New Year's event, it seems), so even those are foreign bred, born, and raised.
Beyond that, though, horses just aren't native to Eorzea. The GC ones from PvP were 'purchased from the Far East' (from the same NPC that was introduced in the New Year's event, it seems), so even those are foreign bred, born, and raised.