One of my boys show market goats has a swollen knee. It entire knee is about 2/3 the size of a baseball. I would guess the total increase is about 15cc. He walks and runs fine. It only seems painful when I really mess hard with it. It is fluid filled. The fluid is under the skin and in front of the knee bones (behind that knee pad). I put a needle in there and pulled about 10cc of a yellowish liquid out of it. The fluid was as thin as water. I am not sure what to do now. Usually, lance and administer antibiotics. This is a market goat that can't have medicines. I want to treat it, but I don't want my son disqualified.