kelbe,
I think you may do well to source a pressure halter for your pony and spend a short time training him to yield to pressure.
You may be best to start in the stable, or at least in a smallish area where he has limited distractions.
Start by asking with the halter, by using a firm, steady push on the rope (with your hand about six inches down the rope under his chin) and, without contacting his neck, use the halter to ask him to back up. You may choose to use the command 'back up', if you wish.
He will resist to begin with but you must maintain the pressure on the rope while watching for the slightest offer of compliance from him..........this may initially be only a slight shift of his bodyweight rather than an actual step back.
Immediately he offers to yield to the pressure, you must give with the hand (stop asking) and reward with the voice.
Next time you ask him, he will react quicker and with more action, ie, he may take a step backward.
Again you must immediately reward him by releasing the pressure and praising him with the voice.
The next step is to ask him to step forward, using the same amount of gentle, firm pressure, this time being ready to release the pressure immediately he steps forward.
If he tries to walk over you, you must be ready to check his forward progress by holding the rope against him and, as he offers to stop, giving the rope, thus rewarding him for taking the check.
Don't be tempted to attempt to hold him with the rope as, if he feels you wrestling with him, he will become too strong for you.
The idea is for you to signal to him what it is you want from him and, as he offers to give, so you should reward him by removing the pressure. If he chooses to stand quietly on the rope, as he will if you're doing it right, he should not feel the halter pressure. Only when you are asking him to do something should he feel any pressure from the halter.
Practice backing him up and moving him around on the rope, rapidly alternating between pressure and release as he complies...........using the halter to help him to understand what is required of him, but remember not to hold him tight when he isn't actually being asked to do anything.
Within a short period of time (usually between five and ten minutes) he should be very keen to be close to you and, as he begins to understand how to avoid feeling the pressure of the halter, will be inclined to watch your movements in an effort to follow you on a slack rope, stopping when you stop, walking on when you do.
When you ask him to walk on, use a touch on the halter to back up your voice command, then leave his head alone as he walks, but be ready to touch the halter to stop him as you stop. Immediately he stops, ask him to walk on again.
Lots of transitions and radical movements back/fore/around will hone his understanding of how the halter works.
Use the halter on him every time you handle him for the next few weeks, and life will become much easier for you both.
If at any time he tries to run over you, because you have him on a long rope, you can step away from him, allow him to run around you until you recover control, then start again.
As long as you don't try to physically restrain him with undue pressure, he will very quickly learn to behave himself.
Good luck
