My 15.3hh, 10 year old Irish Sports Horse mare, was very dangerous in traffic. She would rear up, spin around and bolt in the opposite direction when a tractor, motorbike, Lorry or bus came toward us on the roads. If any of the mentioned vehicles were travelling in the same direction as us, she would bunny hop constantly, canter on the spot and then bolt into oncoming traffic. She also rein snatched every few steps to the extent where she gave me whiplash.
First of all, I assumed it was due to her seasons, because she was even worse when in season. I put her on regumate, but unfortunately there was no difference. Then the vets removed her ovaries. By the time I was able to ride get again after her operation recovery, I had completely lost my nerve. As my last resort I decided to send her to Will to desensitise her to vehicles.