Goes without saying. If you have a tier 4/5 horse in your inventory and regular tier 1 and 2 horses available the game should use the regular horses first and should give a warning before using a rare horse.
Had 30 midlands palfreys in my inventory and a Nahasawi that I was waiting for the riding skill to use and of course the game used the Nahasawi first.
Had 30 midlands palfreys in my inventory and a Nahasawi that I was waiting for the riding skill to use and of course the game used the Nahasawi first.