I have a 10 week old flemish buck that I just bought a couple days ago. He was perfect until this morning.... He is dragging his back legs. He can move his feet but he acts like he is weak in the hind quarters. Has anyone ever had this happen? Should I confine him to a small area? I've read about a parasite that causes this problem. Should I start treating with some kind of wormer? What should I do? Thanks in advance.