I have a calf thats around 5 months old. A week ago I noticed he had some crusty stuff around his eye, but otherwise seemed healthy. The crusty stuff cleared up and he was fine. I fed him this morning and he ate his grain, but tonight when I went to feed, I realized he had only eaten half of his grain. He also had not touched his alfalfa. He grinds his teeth, his breath smells bad, (different from normal), he thrashes his legs, and he's not getting up. We tried to pull him to his feet and he went back down. He's also raising his nose up into the air and breathing heavily. I also noticed the crusties are back again tonight. Any ideas?