Ren, a psychotic Chihuahua, and Stimpson J. Cat, a dimwitted Manx cat who goes by the nickname Stimpy, have a host of unusual adventures.Ren, a psychotic Chihuahua, and Stimpson J. Cat, a dimwitted Manx cat who goes by the nickname Stimpy, have a host of unusual adventures.Ren, a psychotic Chihuahua, and Stimpson J. Cat, a dimwitted Manx cat who goes by the nickname Stimpy, have a host of unusual adventures.