3 yr old leicester/suffolk mix, due (guessing, field bred) around mid Feb. She's already pretty big, no udder. Normal temp. Eating fine. UTD vaccinations/worming. Will BoSE first of Feb - they have access to minerals with selenium. She is walking "stiff" in the hind end. Not her feet, more like her back is sore. Walks slow, gets up and down okay, just slow, stiffly. When she runs she picks up both feet and sort of does this hopping gait. Possibly was knocked when moving into lambing pasture last week, you know, you open the 4' wide gate and 20 sheep try to crowd through at once. I would expect if she was just sore to be better by now (moved the first of Jan). She's no better and no worse. Wondering if the lambs could be settled on something wrong? Give her something for inflammation? I'm stumped. She's wild as a march hare but we cornered her and looked her over, nothing obvious, broken, out of place.