Horse's can not travel through single gates or doors.

Put the summary of the bug you're having here
Horse's when ridden or lead can not go through a single gate or door.

What I expected to happen was...:
Describe what you thought should happen here
I expected to be able to make a corral and let my horse's in and out without having to build an elaborate double door system to do so.

What actually happened was...:
Describe what happened here
I tried to move my horse from a corral to another spot but can't get it through a normal single gate.

Steps to Reproduce:
1. Get on a horse, or attach a lead...
2. ...attempt to move through a single gate or door
3. ...do this as many times as you wish, same result, will not happen