Rats.
Rats is the final story of Lost, Lonely & Lethal, it is about a disturbed war criminal who eats dog food. It was adapted to a 2004 fan film of the same name.
Plot
A sadistic war criminal (and presumed Nazi) stuffs rats in his oven to eat as he mentally rambles about the London Blitz, his arthritis, and how he killed all the 'rats', which were all people. A vigilante known amongst readers as 'The Janitor' kicks down the door and incapacitates him, before shoving his head into the oven, gassing him to death.