We started to notice when the mare centers in the paddock that she doesn't run straight. Instead so running with her hind legs going out straight behind her, her right hind leg goes out to the side, as if it was a wing flapping to the side. I brought the vet backup and she checked for broken bones and dislocations and was confident that wasn't the issue . They believe she has a pinched nerve. They said not to breed her ( I wasn't going to anyway) and she may or may not get well.