Moose is a 10 week old boer kid, a single on his mom living with the herd. No previous health issues but this morning I noticed his back legs seemed a bit wobbly when he was walking. I didn't really think anything about it at the time and this evening it is worse. He can still get up and walk but his back end will just colapse where he is sitting like a dog and then he will either get back up or just lay down there. I have moved him and his momma in a small pen by the house so I can take care of him, but I don't have a clue whats wrong with him. Of course he could have been injured by a big goat or even a horse I suppose, but if it isn't an injury, what could it be? What should I do?