Horseshoes should be added. It could increase the stamina of your horse (or be pre-requisite for using a horse powered plow).
You could also hang them on walls.
I'm not sure that I have a strong argument against sketch colors - Jorb, November 2019 http://i.imgur.com/CRrirds.png?1 Join the moderated unofficial discord for the game! https://discord.gg/2TAbGj2 Purus Pasta, The Best Client
Lets say horses have a chance of getting damage if run on mountain, in caves or on paved ground (like -90% of stamina, endursance and metabolism) and horse shoes protect from that. But when ride on forest biome etc, they should be fine without the horse shoes.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."
I'm not sure that I have a strong argument against sketch colors - Jorb, November 2019 http://i.imgur.com/CRrirds.png?1 Join the moderated unofficial discord for the game! https://discord.gg/2TAbGj2 Purus Pasta, The Best Client