Vet came on Saturday.
He did a quick going over of both hinds and back etc,, and felt strongly that there was no point in blocking below the hock. We took her out, flexed her and trotted her out and she was consistently travelling on three tracks, most prominently at the walk. Left front and hind were lined up on one track, right hind was landing with a slight stabbing motion, to the outside of the right front track.
He blocked the hock, let her graze for a bit and then took her back out trotting on the road. No change.
He then blocked her stifle. This time when she walked out, she was more in line and the stabbing motion wasn't quite as bad. She also didn't have seem to have to gather herself up so much to throw herself into a trot as she had with the previous transitions.
He felt there was enough of a change to consider the stifle worth looking at more. He xray-ed the stifle, did a preliminary look at the xrays and told me that he didn't see much if anything out of place there, but he wanted to take them back to the office and look at them in higher resolution than the little laptop screen.
He got back to me Monday afternoon, he said that her stifle looked very good, with no related bony changes. There was a slightly roughed up looking area on the xray that he mentioned on Saturday but after closer examination he felt it was within normal limits.
He went out to my barn this morning while I was at work and did an ultrasound, so now I'm awaiting the results of that.