I have a long yearling colt that seems to have been born for the Western Pleasure show ring.  However, he cut himself badly a while ago, and it's going to leave a pretty big scar on his leg.  Will that affect winning in the Western Pleasure show ring?  Also, how do I go about training him, as far as groundwork?

A blemish has no bearing on a performance-based class, as long as it doesn't impede his ability to do his job.

 As far as groundwork, you can do the basics like training him for any other discipline.  Get him used to the idea of lunging, wearing a saddle, giving to pressure, etc.  It's not until you get past the basics under saddle (like, whoa, go, and turn) that the training starts to get discipline specific.

Thank you so much!!  I am SO relieved that his blemish won't affect him in the ring (it's not going to make him lame, but it's not going to be a pretty scar)!

Thanks again!!!!