I have a ten year old cow that is getting thinner despite eating plenty of feed. She has a pouch of fluid under her chin that looks like "bottle jaw" that comes and goes. Her manure is very watery. She seems to feel good. I wormed the herd with safeguard blocks about 6 weeks ago and that doesn't seem to have helped her. She has a 3 month old calf on her as well. Should I giver her antibiotics? What kind? What else should I do? Thanks for any advise.