I have a yearling bull calf about 5-600 lbs. Eats well and drinks well. (Watered with CORID for the last 5 days) Just before that he was puny so we gave him a shot of B-12 and pour on wormer. He is looking a lot better. Alert bright eyed and tries to get up but acts like back legs are asleep. Strong and crawls around pen good just won't get up. Help!