julianeAHS

My horse was doing that so I had the vet look at him and it turns out his SI joint is bothering him. He wasn't being naughty, he just crowhopped and then went into the canter - he didn't try to buck me off or anything, that's how I know it was physical. The vet responded by adjusting him and recommending that I build him up very slowly, and really listen to him - if he can't do it, don't push it.
However, if he tries to buck you off - stay safe. Make sure you know your one-rein stop and yielding the hindquarters so that you stay alive to address his pain. If you want a how-to video on the aforementioned, let me know. And call your vet.
-Juliane