Depends what you consider violent really, does it have to include violence between humans?
If not then there are probably thousands of examples, bullfighting and hunting being the most obvious that spring to mind. But here as a few more:
Bear Baiting - Elizabethan England http://en.wikipedia.org/wiki/Bear-baiting
Cock-Fighting - http://en.wikipedia.org/wiki/Cockfight
Dog-Fighting - Its what Pit Bull Terriers were bred for.
Involvnig men we have:
Tournee's - literally mock battles between up to 100 knights using real weapons.
Football - Not the game of today, but a no holes barred fight for possession of an inflated pigs-bladder. The game actually evolved regionally with different shaped balls being used and quite sophisticated courses being chosen to increase both the difficulty and the enjoyment of the contest. In England the revised version was often called "camp-ball". In Cornwall it was called "hurling", and in whales it was termed "cnapan". In these alternative forms of the game a person could use any method needed, even horses, in an attempt to move the ball across the opponent's goal. Injuries and fatalities were not uncommon, as the rules were few and the referee's few and far between.