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.

Host Ira Glass talks with Rosie Schaap about an unlikely love affair between a dog and a parrot, and how the dog betrayed the bird's trust, never to regain it.

Host Ira Glass talks with Andy Woolworth, an executive vice president in charge of new product development at the world's largest manufacturer of mousetraps, Woodstrean Corporation, in Lititz, Pennsylvania. About once a month, Andy is contacted by someone who thinks he's invented a better mousetrap.

A story by David Sedaris about what happens when natural enemies meet, in an Alcoholics Anonymous program, in prison. This story appears in David's collection of animal fables Squirrel Seeks Chipmunk.

David Sedaris reads his new fable about a squirrel, a chipmunk, and a love that could never be. He's the author of many books, including Dress Your Family in Cordoroy and Denim.