Stray : who killed the Doberman?

Collecting the hit mini-series, Stray tells the story of RodneyWeller, the former sidekick known as "the Rottweiler." When his mentor, theDoberman, is murdered, Rodney has to decide if he wants to come back to theworld of capes and masks and, if he does, who he wants to be?Collects Stray #1-4.