This is player owned horse named Speedy that I added to Riverwood to the left of the mill. It also changes the NPC_Horse_MT file. I do not have much experience with creating mods so I do not know if this will conflict with anything.

Horse speed increased to 250
Hose is essential, invulnerable , and cowardly

NPC_Horse_MT file changes

Rotate in place walk/run was 90/90 changed to 360/360
Rotate while moving was 90 changed to 360
Directional change over -- from 45 to 0
Movement speed change over -- from 100 to 0