Bringing this post back out for some more opinions and/or examples. Recently, I started working a 4-year-old mare and she gets in a bind when I ask her to do tighter circles to the left. She starts shaking her head and shouldering, if I get after her she will rear up slightly in the front end.  Just did a vet exam and chiro last week – she showed have thin soles and was tight but nothing major. Then perfectly fine to the right…help!  

Bump

Something not right or she really weak and needs to build up.  tight circles is how I tell where my horses are fitness wise tho I do not do everyday just to check to make sure nothing going on. 

One side can be stronger than the other side.  With her rearing I bet something is wrong and it was missed or wont show for you vet and chiro.