My Quarter Horse mare has a very short stride when she is trotting. I don't know how to fix this. I jave tried long trotting her and using a very forward seat and really urgung her on. She ecspecially does it right before we go into a canter. Could it be that after winter and not being worked consistenly could she just have not enouh back and hind end strength to legthen her stride or is it just defiance. She is not sore she was just vet checked and her saddle fits. She has also just had her teeth floated. At th canter she has avery long stride, same with walking. It's just trotting. I know this isn't her real trot because she has opened up before and it was a beutiful movement. I just don't know why she has stopped doing that.