Working a Young Horse on the Flag RL Chartier explains why trainers work young horses on the flag before introducing them to cattle. By H&R Editors | December 26, 2021 | 1 minute read Using a flag is beneficial for young horses to introduce your horse to cattle. Starting a horse on the flag allows your horse to build muscle memory as he works on the repetition. Click here to watch now! What did you think of this article? Submit Rating Thank you for your feedback!