I have a cow that I have recently noticed to have very bad breath. It almost smells as bad as when a placenta is retained. I smelled it in the barnyard and traced it to her. She is very friendly. She calved in June and is pregnant again. She has a BCS of 6 and shows no outward sign of illness. Eats well and active. I have never experienced this before. Is this a clinical sign of something or just a bad case of bad breath?