I have calf (3 months) that went down - lays on it's side and can not use it's hind legs. It appears to have no strength in it's hind quarters at all. It tries to pull itself up on its front legs but can't get the back legs to cooperate. Gave it antibiotics and energy drinks. Vet says thinks it coccidiosis, but symptoms don't talk about paralyzed hind legs, just general weakness. Any ideas?