they put their head's down because you have assumed the leadership role by them following you. Horse seek to be leaders and they also seek leadership in those that have earned their respect.
Either it's going to roll on you or it's a Western Pleasure horse.
Well it is a process. If you know where the Poll is.....(Between the ears) lets say you are traying to put your halter on the horse. Put your right hand between the horses ears and put pressure....if you horses does not put it head down a little then put more pressure....and so on and so forth....now this is a process so don't expect huge results at first. if your horse puts its head down even a little then take your hand off right away and give your horse a pet. hope that maes sincel.
If you are unbalanced or not paying attention you just might fall or get pulled out of the saddle. If the horse is trying to put it's head down to graze while being ridden, gently but firmly pull upward on one rein until the horse lifts it's head and keeps moving. If the horse is trying to scratch an itch or clear it's nose you should let it so long as that is all it is doing. Some horses will put their heads down as a warning they are going to buck, so be careful and stay balanced.
A bridle.
Well a horse will put it's head down for many reasons. It may be tired and resting, or it could be sick and feel bad. They will also put their heads down to eat or sniff at something, or even to scratch an itch. While being ridden, many horses have learned to put or toss their heads down which will cause their rider to be thrown or yanked out of the saddle if they are not paying attention.
Curiosity.
My preference is to have a qualified veterinarian euthanize the horse.
There are two things you must do!! Number one is never let the horse/pony eat when your on it's back. If the horse rips the rains you must kick and pull the rains until the horse picks its head up. Every time the horse is looking to put there head down pull them up. the second thing is don't let YOUR PONY/HORSE BE THE BOSS OF YOU!!
blinkers
Barbaro
You should probably not because the stallion will try to be the head horse and if gelding wants to be the head horse one of them could get seriously hurt. My grandma's horse isn't known for being mean to other horses and doesn't try to be the head horse but when she put him with her friend's horse he bit eh horse's wither and the horse was seriously hurt andalso Sunny was put with another of her horses and the other horse was found with over 30 bite marks.
You lead a horse with a Head Collar or a bridle which will fir on to the horses head and then you get these reins which you can either sit on a saddle and lead him when your on top or put the reins over the horses head and there. Hope that is what you are looking for