I have a nigerian dwarf buckling that is about 5 1/2 weeks old. He is a triplet. Yesterday night, i noticed that he was limping on his back right leg and was acting a little lethargic. The joint is slightly swollen and he yells whenever the leg is touched, so i decided to splint the leg and pull him from the herd for the night. He was only in with other bucklings his age, and is on the bottle. this morning, he showed no change from the night before. Mid-day, I checked his temp again, and instead of being in the normal range like before, he has a 106.1 temp and acting more lethargic. I'm not sure what has caused this, or what I can do to treat him. thanks in advance.