not allowing the rider to mount

Question
hello sir.my friend has a racehorse. he never allows the jockey to mount.if he mounts, he rears and throws him off. how to fix this problem?

Answer
 Hi Rohit,
 Most of these problems arise from one of two causes:  (a) Fear
                                                       (b) Lack of Respect for Humans
 If you could find out something about the animal's history, it might help in deciding if fear is an issue. In that event one would have to be very gentle with the horse, and gradually try to gain his confidence. I would also suggest starting at the beginning, and "re-starting"(re-breaking) him. There are plenty of good websites on the Internet advising how to do this.
 The more likely reason however, is lack of respect. My system for dealing with this, is to apply pressure(physical or psychological), and not to remove it until the animal at least makes an attempt to comply, at which stage the reward is the complete removal of the pressure.
 Dealing with a rearing horse is potentially dangerous,so the help of someone who is experienced might be required. It would also be a good idea to have the animal's back checked to ensure that mounting him isn't causing him pain.  
 I would put on a headcollar, then thread a rope through the hole in the nearside of the headcollar, run it up over his head, and down the other side, and attach it to the matching hole on the offside. I would use this rope to apply downward pressure to the horses head. I would wait for even the slightest downward movement from him, and on getting it I would reward by removing all pressure. I would repeat this exercise as many as 12 times in one session. You should be able to reach a stage where he drops his head at the merest hint of pressure on his poll.
 When it comes to mounting time I would use the same combination of headcollar and rope. Ideally,if you could find somebody who is both physically strong, and has experience of dealing with rearing horses, to hold him; that would be great. Go through the routine for getting him to drop his head a few times, and then allow him to adopt a stance, where his head and neck are pretty well horizontal. The jockey should be given a "leg up" by a third person, BUT not onto the horses back, but rather, to simply lean over the horse's neck, just in front of the withers. It should be difficult if not impossible for the horse to rear with the combination of being held plus the riders weight on his neck. If this can be managed successfully, I would have the jockey slide off after about 5secs. I would repeat the above about 5 or 6 times without ever completing the mount. If all is still going well, the jockey can easily then complete the mount by bringing his right leg over the horses back, staying low and forward in the saddle, and with a firm grip of the mane, or a neckstrap. I would then lead the horse around for 5 to 10 mins to see if he behaves himself. Subsequent mountings could be performed with a bridle fitted, but I would still have the headcollar and use the same procedure, until I was sure that the problem was cured.