EXTRA CREDIT: Parasite Control Slideshow By - May 14, 2012 0 130 Watch the slideshow below to learn more about parasite control, and then take the extra credit quiz for Club Horse points, or return to the Know Your Enemy main page. The Core Vaccines slideshow is a flash feature. In order to see the entire slideshow, please download Flash. Back to Horse Health College: Know Your Enemy. Back to Horse Health College: Know Your Enemy.