Just taken my horse out for ride, went to trot and he is almost on 3 legs, lame behind but sound at walk. On close inspection there is some swelling just above the fetlock, towards the back and a little heat. Question is, do I turn him back out in field with companion - he's a thoroughbred and occasionally has blonde moments and gallops about for no particular reason, which I think is how he's done this. Or try and keep him in yard, which is a smaller space although he still has tendency to muck about, but obviously can't gallop - still prances and rears tho'. Can't stable him satisfactorily as he weaves and generally hates it - even with mate next door that he can see. Should I put anything on it - poultice or something, or just wait a while and see what happens....