I suppose that would be horses with muscle hyperplasia? (For reference, here's a whippet with that condition: http://s30.photobucket.com/user/breakzhabit/media

I suppose that would be horses with muscle hyperplasia? (For reference, here's a whippet with that condition: http://s30.photobucket.com/user/breakzhabit/media/Stuff/2192-640.jpg.html http://s30.photobucket.com/user/breakzhabit/media/Stuff/2192... )