The mare I'm working with was very iffy about working on the lunge line, and after a few weeks of work I now have her walking and trotting on command and she keeps a good circle going. However, when I increase pressure to ask her to canter (she's quite lazy unless she's spooking) she gets all freaked out, squares up to me and starts pulling. I've tried her in both a halter and bridle with the same result. I can sometimes ask her up nicely for a few strides, then let her drop back down, but the next time I ask, she pulls again. Any ideas about how to keep her moving in the circle and picking up the canter would be wonderful.