Some of the scariest stories happen when fluffy, innocent creatures turn murderously evil. Producer Alex Blumberg tells one such story, about a raccoon gone bad.

Host Ira Glass talks with producer Alex Blumberg and his parents about a bad dog they once had, and how nothing—not getting hit by cars, attacked by bigger dogs, or being shipped off to live on a farm—could stop this dog from coming home. "The Cat Came Back" is sung by Nedelle Torrisi.