Conformation as it Relates to Gait Part II 

It's fun once you get used to it. You'll find yourself eyeing up and analyzing every horse you see though LOL :)

I don't believe the tail itself has much, if anything, to do with the gait a horse performs, or their ability to work strongly off their haunches. The driving force for the strength in the back end belongs largely to other groups of muscling in the back-end, including the abdominal muscles.