Do you think this is something he's learned from previous owners? I'm just asking because when I bought him I had a lot of bad habits to deal with... rubbing his bridle on any hard surface he could get close enough to, bucking and threatening to rear near the barn so he could get away from work, screaming his head off when we worked alone, refusing to move forward, bolting... all of these things have more or less been corrected, with only rare relapses. He has begun to respect me much faster than I expected, which makes me happy. Now we walk and trot forward willingly and behave both in the arena and on trail.
However, this cantering issue gets me... do you think these bucking fits before the canter are another one of his nasty bad habits? Sigh... I just want to make sure I'm teaching him fairly and correctly.