PROCEDURE
It is helpful to have experience performing this skill because a comparative context gives you more insight into the score of a particular horse. That said, use these guidelines to determine what your horse's body condition score is:
1 - Poor - Extremely Emaciated
2 - Very Thin
3 - Thin
4 - Moderately Thin
5 - Moderate
6 - Moderately Fleshy
7 - Fleshy
8 - Fat
9 - Extremely Fat - Obese
TIPS FOR SAFETY AND SUCCESS
Know the areas of the body that are evaluated for a proper assessment of body condition.
Challenge yourself by asking a friend to provide an assessment of your horse's body condition. Did you both arrive at the same score, or close? If not, discuss the differences in your approach. Ask your vet about your horse's body condition score. By asking for another opinion from a qualified professional that evaluates numerous horses, you can ensure your approach to assessment is accurate, or at least in the same ballpark.
However, even Dr. Henneke advises that this system is not precise, but provides a good guideline for assessment. Likewise, the BCS should not be the only tool used to evaluate a horse's overall condition or health. It should be used in combination with other tools or veterinary diagnostics, particularly when assessing cases of suspected neglect.