L’Rain — aka Brooklyn-based experimental singer-songwriter, multi-instrumentalist, composer and curator Taja Cheek — has announced her third album, the confrontationally titled I Killed Your Dog (Oct. 13, Mexican Summer). Our second preview of the “anti-break-up” record after June’s standalone single (and, it turns out, I Killed Your Dog’s closer) “New Year’s UnResolution” is the technicolor “Pet Rock,” out now alongside …