So my husband and I went riding yesterday (nothing strenuous) and when we came back my one horse decided to start acting up. So I did a quick lunging session and next thing I know he is limping. I stopped him right away and took a look at it. His right hind fetlock joint was starting to swell and was warm to the touch. I brought him back over to were we tie them up to get better look at it and he was limping all the way there. The back of the fetlock and a 1/3 of the way up the back leg was hot to the touch and swollen. I wrapped it up in a polo wrap and put him in our dry lot. I went to check on him this morning and he is flexing it more and it is not as hot. But it was still warm and swollen around the fetlock but not as far up the leg as last night. Still lame on it but not as severe as last night. I am not sure what to do, I have never had a horse do this. Any advice would be great and please ask any other questions.