Recently, my horse got into a fight with a 17.1 draft cross. He is only a 15.2 Paint. He was lame on the left hind leg. The next day I went out and he was perfectly fine. Over the next few days he was fine, he was galloping in the field and trotting. I decided to start riding again and the day I went to get him out of the pasture (he was not turned out with any of the aggressive horses) I noticed his right hind leg seemed a little swollen. I asked the barn owner and my instructor what I should do, they felt his leg, there was no heat. My instructor said that light work out would be fine. I walked and trotted him a couple laps and he wasn't off at all. I get off and his swelling had gone down. Once I got him back to the cross ties and untacked he wasn't putting pressure on the right hind leg but once I walked him out of the cross ties he limped for two steps and then was perfectly fine! I have no idea what is going on! Has anyone had this happen? What should I do?! I looked over his leg and there are no cuts or anything!