Why skills need to be removed.
A horse should have its skills assigned as per the assign horse skills but what happens if the skills have been incorrectly assigned. The skills are found on the horse in the statistics tab.
The skill point can be unassigned via an arena. Once the points are freed, use the assign horse skills to correctly assign. Here is an example of assigning skill points. The skill to the (T) can NEVER have the bonus portion removed.