Reporter Excellex bringing news of 1.6.2. This update has just been put out, and fixed quite a few of them horse problems your having.
-Horses can no longer smash them selves into walls and hurt themselves!
-Your valuable animals shall no longer bust out of their pens!
-Your valuable horses shouldn’t be going nuts when sprinting while riding them, since the 1.6.2 update should be improving horse sprinting behavior.
-Ctrl + left click on mac now acts as a right click.