Originally Posted by LadyNeigh
Right please people stop bugging him/her with the hobble danger!!
As a rescue pony you must NEVER please never hobble her (no pony should ever be hobbled anyway)
I'm not fan of hobbles, but I don't see what can be so wrong with using them (given horse is trained correctly to accept them, which usually takes time and patience to teach). However lunging (or riding) with hobbles on IS dangerous and may end up with broken bones (or even neck).
OP, horses don't usually buck out of blue (at least violently). Check for the pain first, than saddle fit. If all is fine then very likely horse is just lacking the training (so you may want to consider working with the trainer dealing with problem horses).