cow shed

The cow's mouth is continuously drooling and she is not eating anything from past 3 days and I also went to the local animals doctor bt it doesn't make any difference in ? situation it's remain same...plz tell me how to prevent this?

I'm not sure if this was the correct place to post this, or even if it was a thread aleady (but I couldn't find it if there was), so appoloiges if I'm in the wrong place. I have been looking for land and a building to rent around the Lapworth area in Warwickshire for 2 cattle (3yo bullock and...