Arent you thinking of Champion the wonder horse?
Nope — I’m thinking of Fury, King of the Wild Stallions!
http://www.youtube.com/watch?v=spSvvp00INY&feature=PlayList&p=AA7C8B1902AA7459&playnext=1&playnext_from=PL&index=35
Who, I am sure, had more testosterone than Gordon Brown’s entire cabinet.