Pit bull advocates who say that the animals make sweet family pets often face opponents who believe the breeds are inherently dangerous and violent. Experts say cases of violence in pit bulls usually stems back to abuse or neglect. Football player Michael Vick, who spent two years in prison for taking part in a dogfighting ring, is speaking out against abuse of the animals and has joined animal welfare groups in opposing "Dog Wars," a mobile phone application that lets users breed virtual dogs for fighting.

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