Horse help

I made my living on Arabian and half Arabian show horses, and thoroghbreds aren't too far off from them.

Any horse is going to ask you a question when you tell him to do something. A quarter horse is going to ask you "should I do it like this, or like this?". An Arab or a thoroughbred is going to ask a question, but his question is going to be "why?". It's up to you to explain to the horse why he should do what you have asked. The best way to get this point across to him is to let him see that he needs to do what you asked of him because it is easier on him than the alternative.

In your situation with a buddy sour horse, I would make it work for the two horses to be near each other. Anytime they are ridden together, make them trot circles. Circles and circles and circles. Eventually, their legs and lungs are going to explain to their heads that being together is hard work, and they need to seek a rest. I would take them apart to allow a rest. If they balk, allow them to return to one another's company, but once again make it work for them to be together. Trot more circles and more circles. Separate them again, and allow a rest. Eventually, their legs and lungs will talk them into being just fine apart. Thoroghbreds can be stubborn, so be patient. Don't get upset, just repeat the excersise as needed.

No method works on 100% of horses. If this doesn't work after a week of this process, may need to re evaluate the situation. However, this is a good method to start with. Don't heat stroke them, but make them really work hard.

Cheers
M