My OTTB rears when being mounted

She had full work up right before I bought her. She was healthy and sound at that point. She is not in heat at the moment either. We use a mounting block to mount her, we are working on getting her used to it. She does not seems to like standing near it. I am beginning to think it may be fear of the mounting block but would not explain why she DOES NOT REAR UP ON ME.

Also I do have a trainer who helps me for those of you who keep saying trainer. I myself also train horses but I did not do her training and am starting all over with a horse who has had about 10 owners in her 9 years on Earth. None of the horses I have trained have had issues with being ridden or being mounted.

I don't care if she doesn't rear on you. Rearing = pain. I would be calling the vet. Horses almost never rear just for the heck of it unless there is a serious gap in the training.

You need a vet and a trainer. At the very least a chiro or massage therapist.

She was checked by a vet about 2 months ago!

That doesn't mean something hasn't happened between two months ago and now.

That is like saying "I can't have a broken arm, I was just at the doctor yesterday".

Again I repeat rearing = pain.

Things like this need to be approached from a "process of elimination" point -- and I always start with the most serious and work down from there. IMO, pain/health issues are the most serious - and, thus, the first I eliminate. No amount of training work will fix a problem that is caused by pain. Once you have had her vetted and established that it is NOT a health concern (you may be mounting/riding/using her in a way differently than the others so that your actions are not associated with pain - that doesn't mean that the fact she does not rear with you means there is no pain), you can start working on other possible causes, ie training.

She has been checked for pain and back issues. I appreciate the advice but please do not talk to me like I am stupid and have no clue what I am talking about. I know it is not a back issue nor soreness nor a bit or saddle issue! I do not know why she began doing it with previous owner but I have checked every obvious possibility! The vet said she is healthy and sound, the trainer who is helping me is also at a loss at this point because after 20+ yrs of training he does not know why she rears on anyone but me!

Let me ask you, OP, do you think you know what is causing the rearing? You seem fairly adamant about what is not causing it, so what do you think is the cause?

I had her checked for back pain two weeks ago. She was fully worked up about 2 months ago but has been checked since!

Well if you insist there is no pain issue and only rears when someone else mounts her besides you, guess you are the one stuck riding her. I would not be putting anyone on this horse unless I wanted them possibly gone from this earth.
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