http://news.petpardons.com/chilling-findings-in-recent-study-of-teen-animal-abuse/
http://www.truecrimereport.com/2011/02/thug_twins_travers_and_tremayn.php
This petition is to ask for the retrial of Travers and Tremayne Johnson who killed a friendly pitbull by setting her alight. They were recently tried but as one of the twelve jurors would not pass the guilty verdict, they were not charged.
The above links provide more details.