Vick was doing something rather monstrous. He has a talent for playing with balls, so what.
I do not see how his playing with balls in a talented way makes him deserving of fame to the degree that his torture of animals makes him worthy of infamy.
I don't think that chickens are trained much, since their fighting is largely instinctual. Mostly they are bred for aggressivity more than trained. Some places ban metal spurs and allow only tortoise shell ones. If the chicken fights without add-on spurs, the fights last too long, they say.
"Too long" seems to be anything over 5 minutes, I have noticed.
It is a bloodthirsty sport, and impossible for me to enjoy in any way.