Haha - I always watch from the ground, her canter scares me :-/ I'm wanting to start cantering her myself, but it's so big and uncontrolled that I'm scared, to be quite frank. I don't think my seat is good enough for that big of a canter (at least not to sit it properly, anyhow... I could stay on, but it would be ungraceful (at best) and uncomfortable for both of us, for sure). I WANT to start cantering her though! I canter other horses fine... fast, slow, heavy on the forehand, one that likes to throw his back legs out a little sometimes, lol... but not my mare!
Have you ever watched cutting horses, and the way some of them pause mid-air when cantering and have to make a sharp turn - they pause then switch leads (although sometimes, they dart back the other direction before their feet hit the ground and they go back to the same lead)? That is EXACTLY what she looks like :-0
Her back legs seem to move fine, however, now that you mention it I will pay attention next time I lunge just to be sure (and when someone rides). She did this with the former owner, she did this with my original riding instructor, she did it with a girl who has been riding for at least 8 years. She DID not do this with my cousin, who is a trainer, nor with a friend who has been riding basically her whole life (and shown successfully up to taking home World titles). She cantered beautifully for them, and it was between the instances of others riding...
She tosses her head really bad, too, when they ride... I don't get it. Thanks for the idea though, and I'll let you know when I have someone canter her next!