Yesterday, my son noticed my wether wasn't acting "right". He seemed sleepy and didn't want to walk. Well, that evening, my other son was walking him back to the barn and he just stopped in the doorway and sat down and didn't want to get up. I went over there and when we finally got him to get up, he was very shaky. His back legs seemed kinda stiff. But wobbly at the same time. They didn't seem to want to hold him up. He also was breathing heavy. His appetite is fine. According to my google search, it sounded like selenium deficiency, so I gave him some of that last night. Today we just left him in the barn so as not to make him walk far. He isn't as shaky and isn't breathing heavy, but is definitely unstable on his feet. Is that what it could be? Could it be something else? If he was deficient in selenium, how long till he starts getting better? Is there anything else I can do for him? I gave him nutridrench just because I figured it couldn't hurt. I have also made sure he has access to weeds, grass, hay, water, baking soda, and minerals. I wanted to cover all the bases!