This document provides guidance on observing dairy cows for health issues. It emphasizes paying close attention to individual cows and looking for differences in behavior, coat, feeding, temperature, cleanliness, injuries, swelling, activity levels, production, discharge and body condition compared to other cows. Specific signs of illness are described for various body systems. Scoring charts are included for body condition and lameness. The document stresses the importance of monitoring temperature as a sensitive indicator of health issues like pneumonia or metritis.